Bose-Einstein condensate created at room temperature

Vortex-L ^ | Feb 6 2013 | Axil Axil

[Kevmo]

Looks like Y.E. Kim's BEC theory for LENR just got a leg up. Criticisms of his theory were that BECs couldn't form at higher temperatures.

[PDF] Bose-Einstein Condensate Theory of Deuteron Fusion in Metal

http://www.physics.purdue.edu/people/faculty/yekim/YEKim-AIP-PNMBTG.pdf

File Format: PDF/Adobe Acrobat - Quick View by YE Kim - Cited by 14 - Related articles where ψBEC is the Bose-Einstein condensate ground state (a coherent quantum ..... Third International Conference on Cold Fusion., October 21-25 Nagoya ...

[Kevmo]

The Cold Fusion/LENR Ping List

http://www.freerepublic.com/tag/coldfusion/index?tab=articles

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http://lenr-canr.org/

[Responsibility2nd]

For those threads when a pancake just won't do.

 

[Vaquero]

This stuff interests me to no end. But I understand bupkis about the mechanics of it. I guess I will wait till it comes on the science channel so as to get the readers digest version.

[Kevmo]

Thanks for bumping the thread

http://www.freerepublic.com/focus/f-chat/2965392/posts?page=19#19

[Vaquero]

Is that a waffle that was morphed via Higgs Bosuns from a pancake?

Cold waffle fusion with pure Vermont quantum syrup. YUM!

[EEGator]

You might as well study the Nazi’s anti gravity flying saucers...or perhaps Charles Hapgood’s Hollow Earth Theory. All equally valid.

[Abathar]

For threads like this I prefer:

[RIghtwardHo]

I may be looking right at it and missing it. Is there a link to the actual presentation of this paper? Utterly fascinating. Thanks for posting. The effect on super conductors alone will be astounding.

[ZX12R]

Is that a waffle that was morphed via Higgs Bosuns from a pancake? Cold waffle fusion with pure Vermont quantum syrup. YUM!

Waffles and syrup would be more likely to generate free energy.

[Kevmo]

The NAZIs did have a flying saucer program, not based upon antigravity but straightforward boundary layer control as laid down by Prandtl in the 1920’s. The allies won the war & got all their secrets.

Why would $multibillion companies like Mitsubishi, STMicro, Toyota, and National Instruments stick their necks out for something like the hollow earth theory?

[Kevmo]

http://www.pnas.org/content/early/2013/01/29/1210842110 Polariton Bose–Einstein condensate at room temperature in an Al(Ga)N nanowire–dielectric microcavity with a spatial potential trap Ayan Dasa,1, Pallab Bhattacharyaa,1, Junseok Heoa, Animesh Banerjeea, and Wei Guob Author Affiliations Edited by Paul L. McEuen, Cornell University, Ithaca, NY, and approved December 21, 2012 (received for review June 28, 2012) Abstract A spatial potential trap is formed in a 6.0-μm Al(Ga)N nanowire by varying the Al composition along its length during epitaxial growth. The polariton emission characteristics of a dielectric microcavity with the single nanowire embedded in-plane have been studied at room temperature. Excitation is provided at the Al(Ga)N end of the nanowire, and polariton emission is observed from the lowest bandgap GaN region within the potential trap. Comparison of the results with those measured in an identical microcavity with a uniform GaN nanowire and having an identical exciton–photon detuning suggests evaporative cooling of the polaritons as they are transported into the trap in the Al(Ga)N nanowire. Measurement of the spectral characteristics of the polariton emission, their momentum distribution, first-order spatial coherence, and time-resolved measurements of polariton cooling provides strong evidence of the formation of a near-equilibrium Bose–Einstein condensate in the GaN region of the nanowire at room temperature. In contrast, the condensate formed in the uniform GaN nanowire–dielectric microcavity without the spatial potential trap is only in self-equilibrium. Bose–Einstein condensation exciton–polariton Footnotes 1To whom correspondence may be addressed. E-mail: ayandas@umich.edu or pkb@umich.edu. Author contributions: A.D. and P.B. designed research; A.D. and J.H. performed research; J.H., A.B., and W.G. contributed new reagents/analytic tools; A.D. analyzed data; and P.B. wrote the paper. The authors declare no conflict of interest. This article is a PNAS Direct Submission. This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1210842110/-/DCSupplemental. Freely available online through the PNAS open access option.

[Moonman62]

In fact this could be important for LENR,

Most likely, nothing scientifically legitimate has anything to do with LENR or cold fusion.

[Kevmo]

hopefully better formatting

http://www.pnas.org/content/early/2013/01/29/1210842110

Polariton Bose–Einstein condensate at room temperature in an Al(Ga)N nanowire–dielectric microcavity with a spatial potential trap

Ayan Dasa,1,
Pallab Bhattacharyaa,1,
Junseok Heoa,
Animesh Banerjeea, and
Wei Guob

Author Affiliations

Edited by Paul L. McEuen, Cornell University, Ithaca, NY, and approved December 21, 2012 (received for review June 28, 2012)

Abstract

A spatial potential trap is formed in a 6.0-μm Al(Ga)N nanowire by varying the Al composition along its length during epitaxial growth. The polariton emission characteristics of a dielectric microcavity with the single nanowire embedded in-plane have been studied at room temperature. Excitation is provided at the Al(Ga)N end of the nanowire, and polariton emission is observed from the lowest bandgap GaN region within the potential trap. Comparison of the results with those measured in an identical microcavity with a uniform GaN nanowire and having an identical exciton–photon detuning suggests evaporative cooling of the polaritons as they are transported into the trap in the Al(Ga)N nanowire. Measurement of the spectral characteristics of the polariton emission, their momentum distribution, first-order spatial coherence, and time-resolved measurements of polariton cooling provides strong evidence of the formation of a near-equilibrium Bose–Einstein condensate in the GaN region of the nanowire at room temperature. In contrast, the condensate formed in the uniform GaN nanowire–dielectric microcavity without the spatial potential trap is only in self-equilibrium.

Bose–Einstein condensation
exciton–polariton
Footnotes
1To whom correspondence may be addressed.
E-mail: ayandas@umich.edu or pkb@umich.edu.



Author contributions: A.D. and P.B. designed research; A.D. and J.H. performed research; J.H., A.B., and W.G. contributed new reagents/analytic tools; A.D. analyzed data; and P.B. wrote the paper.

The authors declare no conflict of interest.

This article is a PNAS Direct Submission.

This article contains supporting information online at
http://www.pnas.org/lookup/suppl/doi:10.1073/pnas.1210842110/-/DCSupplemental.

Freely available online through the PNAS open access option.

[Kevmo]

Thanks for bumping the thread

http://www.freerepublic.com/focus/f-chat/2965392/posts?page=19#19

[Moonman62]

File Format: PDF/Adobe Acrobat - Quick View by YE Kim - Cited by 14 - Related articles where ψBEC is the Bose-Einstein condensate ground state (a coherent quantum ..... Third International Conference on Cold Fusion., October 21-25 Nagoya ...

That conference was held in 1992 back when cold fusion was like the real estate boom of the 2000's.

[Moonman62]

Thanks for bumping the thread

Put me on your ping list so I can bump it sooner.

[Kevmo]

Again, no. Your stalking works. You bump these threads faster and more frequently than 90% of those on the LENR ping list. Not that what you say is worth reading, but at least you bump the thread.

[FredZarguna]

It's actually very simple. Quantum systems involve "entanglement" of the wave functions of the particles involved. [Unlike Classical Physics, where the location of the particles alone specifies that they are distinct.] In quantum systems, if you have two particles, you never really have two distinct particles. You always have a system composed of two particles; there is no way to tell which one is which.

It's like having identical twins with absolutely no differences, and they themselves do not even know who is who(m). When you combine the wave functions of those two particles, they can be either symmetric or antisymmetric when the positions of the two particles trade places.

Particles that pair in systems that give rise to antisymmetric wave functions are called fermions. Particles that pair in systems that give rise to symmetric wave functions are called bosons.

Systems made up of very large numbers of fermions must essentially have one energy level for each particle in the system (this is not exactly true -- there is a complication but it doesn't change things much conceptually, so read on.) Systems made up of very large numbers of bosons do not need to have more than a single energy level for ALL of them (they usually do, but they don't HAVE TO.)

At all but VERY LOW temperatures, there are many energy levels available, so systems composed of many fermions at high temperature look just like systems composed of many bosons at high temperature. But, as the temperature falls, there is less and less energy available (that is actually nothing more than the microscopic definition of temperature.) This means there are fewer and fewer energy levels to occupy. For bosons, this is not a problem, because all of the bosons can occupy the same energy level if they have to. However, with fermions, each fermion must have its own energy level, so no matter how low the temperature goes, there are fermions "locked" into higher energy states.

Think of fermions like this: your kids are not grown up, and they get to bickering in the back seat when they touch each other (Dad! He's touching me!) You may have a van with three rows of seats that theoretically holds nine kids, but because of the Notouchy Effect (Pauli Exclusion Principle) the kids must each have their own row of seats, so your car can hold no more than three kids, if your kids are fermions.

On the other hand, the Brady Bunch kids are all perfect and love each other and are willing to sit in each others' laps if necessary. You can fit all six Brady kids all into the same row. Those are bosons.

Because systems with large numbers of fermions must fill large numbers of quantum levels, even at low temperature, they behave much differently than systems of bosons, all of which are willing to fit into the lowest available state.

[Now there is one very slight omission I promised to get back to: two fermions with the same "spin" quantum number are not actually in the same state even if they have the same energy. Quantum spin for fermions can have one of only two possible states. So in fact, each energy level for fermions can contain two, not just one particle(s). The idea is still the same.]

[EEGator]

I was referring specifically to the anti gravity “zero-point energy” based power systems. I figured you’ve probably seen videos online.(conspiracy theory explanations)

You seem like a smart guy, I don’t know why you waste your scientific inquisitiveness on cold fusion, LENR, and specifically Rossi.