Gregory Chaitin on cold fusion research: Japan and Sweden are the “only two countries with the political will”

Gregory Chaitin is a Professor of Computer Science and Philosophy of Computing at the Federal University of Rio de Janeiro, Brazil. Here he discusses the landscape of LENR with Tom O’Brien posting on podomatic. Chaitin gives Andrea Rossi credit for bringing cold fusion to a wider consciousness and mentions Mats Lewan‘s new book An Impossible Invention, which he finds to be an excellent look at the unveiling of the E-Cat.

Go to Tom O’Brien‘s interview with Gregory Chaitin on Podomatic here.

He also touches on the 2014 CF/LANR Colloquium at MIT held on the 25th Anniversary of the announcement of cold fusion, a bit of the science and politics behind LENR, the current lack of an accepted theory, and Japanese and Swedish research.

Chaitin is particularly impressed with Clean Planet, Inc., and newly formed group dedicated to bringing LENR technology forward through funding and support. Listen to Clean Planet’s Hideki Yoshino present some of this research work [.pdf][.mp3] performed by Tadahiko Mizuno and his team at the recent Colloquium at MIT, or watch the video here.

Related Links

Mats Lewan Interview: E-Cat, Andrea Rossi, and An Impossible Invention

2014 CF/LANR Colloquium at MIT presentation archive

Industry and academic partnerships report from JCF-14 meeting

Rossi E-Cat energy “off the chart”

“An Impossible Invention” review by Brian Josephson

Nobel laureate Dr. Brian Josephson commented on Nature with a review of Mats Lewan‘s new book An Impossible Invention, chronicling the early work of Andrea Rossi, engineer and inventor of the Energy Catalyzer, or Ecat. The Ecat is a commercial steam generator based on nickel-hydrogen exothermic reactions that is now in development. Lewan had a front row seat for several of the public and private demonstrations that Rossi performed since January 2011, and has interviewed Rossi extensively on his work.

We reproduce what Josephson wrote here:

The highlight of the week was the publication of Mats Lewan’s book ‘An Impossible Invention’, subtitled The true story of the energy source that could change the world. The author, a science and technology writer, has been investigating the controversial Rossi reactor or E-cat in depth in the 3 years since its initial presentation in Bologna in January 2011.

The first part of the book covers Andrea Rossi’s previous inventions, showing how life is not easy for an inventor whose inventions pose a threat to other enterprises. This is followed by what Lewan has been able to glean about the invention since the initial demonstration, purportedly of a fusion device creating some kW of heat.

Besides following the course of developments in detail, Lewan gives much attention to the question of whether the device is genuine, or whether fraud is involved. One important event was a long-period investigation, published at arXiv:1305.3913, providing strong evidence of the production of anomalous heat. Particularly interesting to me, in the light of my past dealings with arxiv, was the text of an accidentally leaked exchange between two moderators, wondering if they could find a rationale for blocking that report.

In the course of his attempts to bring his device to a commercial conclusion, Rossi had problems with collaborators, being suspicious of their motives, but it seems he has found an (undisclosed) American firm that he trusts, who have been licensed to develop the device. This fascinating book provides the answers to many questions about the E-cat, and should be read by all skeptics.Brian Josephson

Commercial Developments presented at 2014 MIT Cold Fusion Conference

The recent 2014 Cold Fusion/LENR/LANR conference from March 21st to March 23rd at Massachusetts Institute of Technology happened to overlap with the 25th anniversary of the announcement of the discovery of cold fusion at the university of Utah. Against all odds, huge strides in understanding the phenomenon were made in the last 25 years. Recently, groups have shown that this is more than a lab curiosity, it can be engineered and harnessed to safely solve the worlds energy problems. This is an overview of some commercial groups which presented at the 2014 MIT conference.

 

Jet Energy operated by Dr. Mitchel Swartz was the organizer of the conference and also presented some very interesting findings. They have been working with very small devices which can be used as a demonstration unit or operated in a huge array to produce commercial levels of heat. Dr. Swartz has been active in the field since the very start and is constantly improving on his device, the newest generation being called the Nanor. Dr. Swartz’s devices are unique because the loading and operation stages of the device are separated, allowing for simple plug-and-play operation which greatly simplifies use by groups trying to study the effect. Jet Energy has published cold fusion research since the late 1980s, Jet Energy’s recent developments involve using a magnetic effect to boost the output of his devices, which have seen COP’s of 100. This reinforces the recent developments in understanding the effect, magnetism is seems to play a role in both the cause and effect aspects of cold fusion. Dr Hagelstein of MIT made an interesting comment during one of Dr. Swartz presentations, “I can’t for the life of me understand why graphs showing gains of over 100 are being rushed through”. This is a symbol of how much things have improved in the last 25 years. We are moving from just trying to prove the effect really exists to starting to understand the cause of the phenomenon and develop commercial units from the technology.

MIT Conference video: http://www.youtube.com/watch?v=RBDImkDZ4h8

 

Clean Planet, a Japanese group with Dr. Tadahiko Mizuno as the lead scientist made their debute at the MIT conference, represented by Hideki Yoshino. Mizuno is a household name in the Cold Fusion field and has developed many well referenced experiments. It appears he has found the financial backing required to attempt to bring a commercial reactor to market. At the conference, Clean Planet showed off their proof of concept reactor which operates at a COP of 1.9 as well as some other reactors being built which are made to operate at the 1kw and 10kw power level. Their reactor is simple and an amazing spectacle to watch. Using normal nickel mesh, they create a brilliant plasma to sputter the surface of the metal, cleaning it and creating surface nanostructures which kick off the Cold Fusion effect. Preparing their material inside of the reactor may solve some of the material consistency issues other commercial groups are struggling with. They have a well equipped lab with gamma and neutron radiation detection, although they have not seen any consistent hard radiation outside their reactor during excess heat, they have some some occasional bursts. Clean Planet also presented mass spectroscopy results which confused many scientists and has started a wave of speculation regarding theory. In the mass spectroscopy results, higher masses decreased during excess heat at the expense of lower masses, opposite to what would be expected of fusion events. Clean Planet was quick to point out that these results should be seen as preliminary, their equipment can not separate deuterium and helium so until their outside gas analysis comes back they don’t have solid information. Japan is in dire need of this technology and has historically been supportive of cold fusion research, we can expect Japan to have a serious presence in the Cold Fusion commercialization race. While Mizuno skyped in, his group was represented at the conference by multiple businessmen, they look to have all the resources they need and attracting funding and talent should not be an issue. This is a company to keep an eye on, they could quickly develop a foothold at the head of this field.

MIT Conference video: http://www.youtube.com/watch?v=DB_MRUX4mo0

 

Mitsubishi Heavy Industries research program, headed by Dr. Yasuhiro Iwamura had some big developments since their last presentation 8 months ago at ICCF18. They are focusing on technology which maximizes transmutation using a gas permeation process, previously reporting that they were able to use the cold fusion effect to transmutate cesium to praseodymium, essentially producing a valuable material from a radioactive waste. While transmutation in this field has been a proven reality, a well funded drive to engineer this effect could lead to enormous advances in many fields of technology. Transmutation could solve both issues with nuclear contamination as well as material scarcity, including exotic isotopes. A research program at NRL failed to replicate these results, at ICCF18 Dr. David Kidwell spoke the same day as Dr. Imawura about NRLs failure to replicate the results, he was overly aggressive and had a very mocking tone, accused them of improper use of equipment, sloppy work and accidentally spiking samples after apparently finding praseodymium contamination in their lab. While the motives behind the NRL bullying were foggy, they ate crow pie a few months later when Toyoto affiliated labs published results showing that they had replicated the transmutation effects in this experiment. MHI originally they used gas permeation through a palladium film ion-implanted with cesium to trigger the effect and transmutate the cesium to praseodymium. At MIT, Dr. Imawura showed new developments in their transmutation research, they started developing modular experiments so they can scale up the device to commercial levels. Dr. Imawura revealed that they had began hybrid electrochemical experiments where they are using cesium in a liquid solution. This may not only be more effective due to the known electrochemical methods of triggering the effect, but it will also have engineering benefits such as cooling and scalability. This is an enormous breakthrough if it can transmutate Cesium in a liquid solution at high yields. Considering water contaminated with cesium is the main contamination at Fukushima, this technology could not only clean up the radiation but also generate heat as a side product. The potential here is enormous, not only for Japan, but for the world, and Mitsubishi Heavy Industries is quickly moving forward.

MIT Conference video: http://www.youtube.com/watch?v=OzZl9l8nn1c

 

Permanetix Corporation is a new startup which was announced at the conference, President Nikita Alexandrov, in his mid twenties, is one of the youngest researchers involved in this field. Permanetix Corporation is developing tools and experiment techniques to better study the cold fusion effect. He explained how low cost tools and new scientific instruments can help solve the cold fusion problem in the same way that they revolutionized the human genome project. He presented a robust radiation sensor which can be placed in a gas loading experiment, detecting all the low energy radiation that does not pass through the reactor walls. They detected alpha radiation testing the device, meaning that they should also be able to use this as an internal tritium detector, since tritium also emits soft radiation. Nikita Alexandrov also spoke about the challenges of real time helium detection technology and how to design a low cost helium isotope analysis system. While they have prototypes of new tools, they also presented their long term research plan, involving the mass testing of precisely created materials for the cold fusion effect using advanced versions of their tools. Both companies developing reactors as well as researchers interested in the basic science could benefit from the discovery of new materials. But since Permanetix is not making reactors, it is a challenge to fund until cold fusion is a household word. Brian Ahern, who funded many research projects during his time at DARPA, spoke up after the presentation, “You are obviously leading, or ahead of the field so funding will be a challenge”. Permanetix technology could lower the barrier to entry for research companies starting in this field. If they prove themselves and can attract the large amount of funding required for a mass materials screening project, there is no doubt their approach could pay off tremendously.

MIT Conference video: http://www.youtube.com/watch?v=RsR4rrP22Uc

 

The LENR Industry Association was represented by Steve Katinsky and presented their plan forward at the MIT conference. This trade group will position itself as a facilitator of cold fusion technologies, involved in the education and adoption of cold fusion technology worldwide. This is an important step because it shows that even in such a highly competitive field, groups are willing to work together to do what it takes in making this technology a reality. Already over two dozen groups have pledged membership to this association, involving entities such as Naval Research Lab, two branches of NASA, as well as SKINR, commercial groups and other international research entities.

MIT Conference video: http://www.youtube.com/watch?v=TMNSl-nrFXQ

 

SKINR is one last non-commercial group is worth mentioning. Sidney Kimmel Institute for Nuclear Renaissance at University of Missouri was formed by a large private investment, absorbing one of the most successful cold fusion companies at the time (Energetics) into the university. Even though they are not a commercial entity, they are possibly the most well funded and equipped research group operating today. SKINR had an excellent presentation summarizing their work in the field, available here. They are currently running many experiments in collaboration with other groups, recently adding industry giant Aerospace Corporation, a move which shows that industry leaders are biting off on Cold Fusion. SKINR is funded for the next 4 years and have constantly been innovating and learning more and more about the science behind the cold fusion effect. Recent developments include a method of surface analysis which can predict if a material will be active as well as new experiments to detect low energy radiation. Their parting message was that if low energy radiation is used as an indicator of cold fusion, it is possible to detect events down to the femto-watt level of excess heat! With multiple groups developing new experiments and techniques for studying the effect, it is expected that huge strides will be made in understanding the cold fusion effect in the coming months and years.

MIT Conference video: http://www.youtube.com/watch?v=iWL6VUPSqKQ

 

Many groups were not represented at the conference, with some of the largest commercial players absent. Defkalion was registered but pulled out last minute, which is unfortunate because researchers were very curious about the huge magnetic anomalies present in their reactor which they mentioned briefly at ICCF-18.

Leonardo corporation, the company formed by Andrea Rossi which is leading the field in terms of commercialization was of course absent. They have not presented at any recent conferences and are more focused on rapid commercialization. Recently partnering with some powerful American backers, it is rumored that they will release third party test long duration test results in the next few weeks, if the results are anywhere near as positive as the previous published tests, this field may see an explosion of interest and may finally get the recognition it deserves.

President Obama and LENR Energy – Cold Fusion Now

Is President Barrak Obama or MIT aware of developments in LENR Energy?

MIT blocked funding to cold fusioneer Haglestein for LENR Energy research in 2012.

Obama is mute concerning NASA and SPAWAR breakthrough LENR Energy (popular cold fusion) research and engineering.

Here’s an announcement from Mitchell Swartz’s Cold Fusion Times web site of a conference to be held at MIT on March 21-23, 2014, to commemorate the 25th anniversary of the Pons-Fleischmann news conference where they introduced their cold fusion research to the world. I expect more details will be forthcoming.
COMMEMORATE THE TWENTY FIFTH ANNIVERSITY OF COLD FUSION ENERGY SCIENCE AT MIT
THE ANNIVERSITY OF THE  DISCREDITING OF THE ART OF COLD FUSION RESEARCH AND SCIENCE AT MIT
25th Anniversary of the announcement of CF/LANR: March 21-23, 2014 – 2014 Colloquium on CF/LANR at MIT

Speakers: Peter Hagelstein, Mitchell Swartz, Larry Forsley, Frank Gordon, Pam Mosier-Boss, George Miley, Robert Smith, Tom Claytor, Mel Miles, John Dash, Yiannis Hadjichristos, Yeong Kim, Vladimir Vysotskii, Yasuhiro Iwamura, Charles Beaudette

A Google  search of “Obama LENR” http://www.google.com/search?client=safari&rls=en&q=obama+lenr&ie=UTF-8&oe=UTF-8#q=%22obama+lenr%22&rls=en On Dec. 6, 2013  yields this:

Obama Calls Oil “Fuel of the Past”, Pushes Alternatives — Does He Know About LENR? March 8, 2012. E-catworld

http://www.e-catworld.com/2012/03/obama-calls-oil-fuel-of-the-past-pushes-alternatives-does-he-know-about-lenr

“LENR and the U.S. Election” April 14, 2012. Nickel Power http://nickelpower.org/2012/04/14/lenr-and-the-u-s-election/

  1. Questions:1 – What position by Obama would benefit his election campaign, what would hurt him?2 – What position by Romney (I presume he’ll be the Republican candidate) would benefit his election campaign, and what would hurt him?

    3 – During the next term, what role should the president play regarding LENR?
  2. nickelpower.org/2012/04/14/lenr-and-the-u-s-election/

    Apr 14, 2012 – The amount of energy that has been flowing on the previous thread has inspired me to turn it into a post. My short opinion is this — if LENR gets 

  3. ECAThome | All about ECAT

    www.ecathome.eu/

  4. Obama LENR | ECAThome

    www.ecathome.eu/?tag=obama-lenr

  5. Obama Unveils New Climate Change Policy — LENR … – E-Cat 

    ecat-news.com/…/obama-unveils-new-climate-change-policy-lenr-e-cat-…

  6. President Obama Cold Fusion/LENR: Is an October Surprise …

    ecat-news.com/…/president-obama-cold-fusionlenr-is-an-october-surpris…

  7. Buy, Sell, Hold — Which Industries Will Prosper or Decline in an 

    conservativebyte.com/…/buy-sell-hold-which-industries-will-prosper-or-…

  8. Cool Fusion – There seems to be little or no help for low… | Facebook

    https://www.facebook.com/permalink.php?story_fbid…id…

  9. Obama’s 2013 NASA Budget Request Shifts Funds from Mars to 

    article.wn.com/…/Obamas_2013_NASA_Budget_Request_Shifts_Funds_…

    1. Obama Calls Oil “Fuel of the Past”, Pushes Alternatives – E-Cat World

      www.e-catworld.com/…/obama-calls-oil-fuel-of-the-past-pushes-alternati…

    2. nickelpower.org/2012/04/14/lenr-and-the-u-s-election/

    3. www.ecathome.eu/?tag=obama-lenr

    4. obama | ECAThome

      www.ecathome.eu/?tag=obama

    5. Obama Unveils New Climate Change Policy — LENR … – E-Cat 

      ecat-news.com/…/obama-unveils-new-climate-change-policy-lenr-e-cat-…

    6. President Obama Cold Fusion/LENR: Is an October Surprise …

      ecat-news.com/…/president-obama-cold-fusionlenr-is-an-october-surpris…

    7. Buy, Sell, Hold — Which Industries Will Prosper or Decline in an 

      conservativebyte.com/…/buy-sell-hold-which-industries-will-prosper-or-…

  1. Federal cold fusion | ECAThome

    www.ecathome.eu/?tag=federal-cold-fusion

  2. article.wn.com/…/Obamas_2013_NASA_Budget_Request_Shifts_Funds_…

    1. obama lenr | eCat Now! – Rossi eCat News

      ecatnow.com/tag/obama-lenr/

    2. ecatnow.com/tag/lenr-pollicy/

      lenr politics | eCat Now! – Rossi eCat News

    3. ecatnow.com/tag/lenr-politics/

    4. ecatnow.com/tag/obama/

    5. buy | eCat Now! – Rossi eCat News

      ecatnow.com/tag/buy/

LENR: The Debutante at the Ball


The Cold Fusion research of Fleischmann and Pons was an anomaly in and of itself. Two electrochemists, while having a bit of fun with the maximum loading of hydrogen into palladium in an electrolytic cell, ventured into a realm of subatomic phenomenon. No one had been there before in quite this way.

They hazarded to say it was nuclear, and got blasted.

These two electrochemists had no assistance from other branches of science in trying to figure it out. Nobody came to their assistance. In fact, those who should have joined in this scientific quest, ridiculed the pair as charlatans. Instead of helping out these two lone electrochemists with a scientific dilemma, leaders in the nuclear scientific community of the U.S. government-funded Department of Energy (DOE) labs ridiculed them to no end. This left the two fellows to fend for themselves while being kicked out of the tribe, so to speak.

Luckily, the few scientists who had found positive results during the DOE-sponsored race to replicate the Fleischmann-Pons Effect (FPE) persisted, mostly in obscurity and without funding, in this query of the unknown.

Cutting edge experimental science requires patience, honest sharing of data, and evaluation for a continued improvement of the experimenters’ ability to enter into an unknown realm; which is to actually observe and record aspects of a difficult to create phenomenon and thereby test theory. In this manner, our understanding within the unknown realm grows.

I publish. You review after working it a bit. Always improving experiments. Together with theorists, we collect data, analyze and implement sound suggestions, always moving forward, advancing the science. Open collaboration quickens this difficult quest into the unknown. Open and enthusiastic collaboration by all branches of the scientific community into the query of the unknown is the basis of good science and is essential for the birth of a new science.

These early cold fusioneers formed an association of the shunned and published in a few “unrecognized” trade journals which they had to create in order to continue the scientific process in this controversial field. The Internet had appeared before the observed 
Fleischmann-Pons Effect (FPE), freeing these researchers from the limitations of the printing press.

The printing press had advanced science simply by causing more researchers to be reading more researchers work, which caused a quickening of the scientific process. 

I publish. You review it after working it a bit (through meticulous experimentation and collection of data). Together with theorists, we improve our ability to observe and record phenomenon,  improve analysis of data, always moving forward.

Today’s scientists no longer face the hurdle of a publisher’s peer review to get work printed. If you have fallen into an unknown realm who is your peer? Obviously only those who you find there with you. The Internet allowed the peers of cold fusion research to publish, which is the first step in involving the larger community in your scientific endeavor. Only after publishing can true scientific review begin.

Many of the established branches of science could have assisted Fleischmann and Pons with a few of their questions. These two were wondering what was actually going on. They also were trying to figure out, why, during different runs of their experiments, some cells produced nuclear levels of energy while others did not. None of those in mainstream science helped them to answer any of the questions concerning the new realm they were entrusted with.

The people who are experts in atomic theory had nothing to add. The people doing high-energy subatomic research at CERN or Lawrence Livermore had nothing to add. Thermoelectric devices are almost like LENR devices, without the hydrogen. Yet the mainstream thermoelectric crowd offered no assistance even though their grandfather, Harold Aspden, had became a godfather to new cold fusion research. Even the emergent semiconductor field could have assisted this new science with their knowledge of dopants and understanding of the adolescent quantum field branch of science.

None of these folks showed even a bit of healthy scientific interest in this work. Almost all their curiosity evaporated into thin air. After the announcement of the birth of cold fusion research people were thrilled. Then to have virtually all curiosity evaporate within the whole scientific community, is an anomaly of such a magnitude that it is hard to comprehend. These lone researchers from a single branch of science, with their Internet printing, were left to care for this newly born area of research by themselves, held separate from the larger scientific community. They were left without communal guidance or assistance in their care of this new unknown scientific field, the infant known as cold fusion research.

Fleischmann and Pons were just trying to figure it out. Who knows how dirty their electrical currents were? Might there have been harmonic frequencies created upstream of their current supply, caused by any number of other electrical equipment being turned on, or turned off, at the same time? (My TV used to go fuzzy when the neighbor turned on his table saw.)

These electrical eddy currents could cause one cell to go positive, with nuclear dense energy being produced, while another, without this added focusing of energetics, would be a dud. Would there be pulsations created simply by a portional electrical on/off factor, thereby creating superwaves or standing wave formations? Are influential magnetic moments created within such electron dense environments? Are harmonic frequencies within the lattice the key?

What surface topography or nano engineering is required? Are the  proper fractal geometries essential for equilateral fusion firing and control throughout the system?  Do we need some dopants thrown in? Do we need to get the advanced materials folks engaged in doing some Edisonian style research with every known metal and alloy? Is an unknown source of energetics thrown into the mix, such as dark energy or gravity?

How might one capitalize on these many components within the atomic and the subatomic realm of the cold fusion nuclear reactive environment? Are angular eddy currents within the electron shell a key? Or specific angular thermal currents? Do subatomic transmutations within the molecular liquid crystal plasma create atomic transmutations, on an atom by atom basis? 

So many questions faced Fleischmann and Pons in their efforts to sustain this child that, unassisted by the larger community, the new science of cold fusion barely survived. Luckily the science did and she is growing up, as we shall see.

Science has been progressing nicely since the birth announcement of cold fusion research in 1989. Quantum physics and engineering has matured since then. After a battle for acceptance, it is now seen as a branch of science that will advance us beyond our present understanding of known Einsteinian physics. Nano-science has emerged fairly well developed, with exciting possibilities, being fully realized quite quickly.

Both of these branches of science have been openly courting cold fusion research and standing within the low energy nuclear reaction environment for some time. Once an ugly duckling, now a beautiful swan, LENR Energy is now considered to be exciting and full of potential. Highly energetic with no known faults LENR Energy attractive and much sought after.

LENR Energy Science and Engineering is finding herself best able to thrive as a multi-disciplinary field. LENR is the debutante at the ball. With some really great features: Clean inexpensive energy. Both LENR Electrical and LENR Thermal are embodiments of her grace.

We would certainly be amiss if we failed to mention the most attractive features. LENR energy transmutes radioactive waste while driving the turbines. My kinda gal. And when she steps onto the dance floor she actually flies, with the grace of a modern spaceplane and the beauty of a Boeing 747.

My hope is she will capture the attention of the semiconductor and thermoelectric crowd soon. Now that I stop and think on this, they are probably dancing together already. We will soon see.

Laboratoire de Physique Théorique – Toulouse – UMR 5152
A gauge theory picture of an exotic transition in a dimer model
http://www.lpt.ups-tlse.fr/spip.php?article432&lang=fr

We study a phase transition in a 3D lattice gauge theory, a coarse-grained version of a classical dimer model. The dimer model on a cubic lattice, first studied by F. Alet and collaborators, displays a continuous transition between an ordered columnar phase at low temperature and a disordered phase at high temperature where dimer-dimer correlations show an algebraic decay. This is rather unusual as the standard Ginzburg-Landau theory of phase transitions generally predicts an exponential decay of correlations in the disordered phase.

This phase transition is “exotic” in the sense that it cannot be simply explained by the spontaneous symmetry breaking of an order parameter. The existence of such unconventional continuous transitions is still very controversial, numerous authors pointing at an artifact due to a very weak first-order driven process.

To have a better understanding of the dimer model, we show, using duality arguments, that the classical dimer model can be mapped to a frustrated XY spin model coupled to a gauge field. The ordering transition is then naturally understood in terms of a Higgs mechanism. A Monte-Carlo study on large system sizes of the dual model indicates a second-order transition with exponents close but slightly different from those of the simple XY model. In order to confirm the type of the transition, we perform a flowgram analysis, a powerful numerical tool to test the nature of a transition. The results of the flowgram are unambiguously pointing toward a continuous transition.

Post-scriptum :

For more details, see the original paper Gauge theory picture of an ordering transition in a dimer model, by D. Charrier, F. Alet, P. Pujol in Phys. Rev. Lett. 101, 167205 (2008)

Mardi 12 fevrier 2013-14:00
Spin-dependent thermoelectric transport in HgTe/CdTe quantum wells
http://www.lpt.ups-tlse.fr/spip.php?article1000&lang=fr

Marine Guigou (LPS Orsay) par Bertrand Georgeot – 12 février

HgTe quantum wells are known to host, under a topological phase transition, the quantum spin Hall effect. The latter refers to the presence of metallic edge states moving in opposite direction for opposite spins. Recently, HgTe/CdTe quantum wells, among others topological insulators, have been proposed as good materials for thermoelectric conversion. The basic idea relies on the topological protection of the 1D edge states that prevents reduction of electrical transport in disordered systems. Their efficiency to convert heat into electricity is based on the dominance of the edge modes on transport [1,2].

During this presentation, I will discuss about the thermoelectric properties of HgTe/CdTe quantum wells through the analysis of Seebeck and spin Nernst coefficents in a four terminal cross-bar setup. As a lateral thermal gradient induces a longitudinal electric bias and a transverse spin current in such a system, each of them can be used as a probe of the topological regime as well as finite size effects of the quantum spin Hall insulator. Furthermore, I will present a qualitative relative between effective mass of particles and magnitude of spin Nernst signal which allows to provide an explanation of the observed phenomena based on anomalous velocities and spin-dependent scattering off boundaries[3]

[1] R. Takahashi and S. Murakami, Phys. Rev. B 81, 161302 (2010).

[2] O.A. Tretiakov, A. Abanov, S. Murakami, and J. Sinova, Appl. Phys. Lett. 97, 073108 (2010).

[3] D.G. Rothe, E.M. Hankiewicz, B. Trauzettel, and M.G., Phys. Rev. B 86, 165434 (2012).

When spontaneous transmutation of particles occurs in a quantum liquid.

Phys. Rev. Lett. 109, 016403 (2012)

par Carlos Lamas – 12 juillet 2012

Toutes les versions de cet article : English , français

The nature of doped insulators (where electrons experience strong repulsion) is a key issue that has been debated for years : it was first suggested that fermionic dopants (fermions are particles that can not share the same quantum mechanical state) can change into bosonic particles (bosons are particles that can occupy the same quantum mechanic state) – so-called statistical transmutation. This spectacular phenomenon is made possible by the exotic nature of the parent insulator, a quantum liquid which might be viewed as a “soup” of fluctuating close-packed dimers. Such a state is shown to exhibit emergent (topological) quantum defects that can bind to dopants and change their fundamental quantum properties and statistics (fermionic or bosonic statistics). In a recent Letter, C.A. Lamas, A. Ralko, D.C. Cabra, D. Poilblanc and P. Pujol have proven the existence of a “statistical transmutation” symmetry : the system is invariant under a simultaneous transformation of the statistics of the dopants and change of the signs of all the dimer resonances. The authors combine exact analytical results with high performance numerical calculations to clarify this issue. The exact transformation developed in the letter enables to define a duality equivalence between doped quantum dimer Hamiltonians, and provides the analytic framework to analyze dynamical statistical transmutations. These results constitute a fundamental step in the understating of a broad family of new phenomena in the large community of strongly correlated electronic systems.

Reference : C. A. Lamas, A. Ralko, D. C. Cabra, D. Poilblanc, and P. Pujol, Phys. Rev. Lett. 109, 016403 (2012)

Cold Fusion Radio’s James Martinez on Buzzsaw

From TheLipTV Channel on Youtube:

Cold Fusion, nuclear power and the global economy are put under the microscope with guest James Martinez in this full length interview for Buzzsaw with Sean Stone. We take a look at the possibility of free energy revolution–from Andrea Rossi’s game changing technology in cold fusion, to the credit based economy, mind control and more,

GUEST BIO:
James Martinez is a Media Ecologist, Radio Talk Show host and pioneer in radio broadcasting and behavior modification. He was born in San Diego, California and grew up in Brazil, England and Europe. After attending University he began working for a retired Federal Agent and one retired Naval Intelligence officer. He is an accredited member of the press for American Media Distribution and has been a consultant for True TV’s Conspiracy Theory and has consulted for Emmy Award winning actor Eion Bailey for show entitled “Imagine This!” Mr. Martinez can be heard on the Achieve Radio Network and soon the first men’s network Protection For Men.

James Martinez began Cold Fusion Radio with his interviews with scientists and business leaders in the cold fusion research arena.