[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.

[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.

[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.