title: Polariton Bose-Einstein condensate at room temperature in an Al(Ga)N nanowire-dielectric microcavity with a spatial potential trap.
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.
authors: Center for Photonic and Multiscale Nanomaterials, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109, USA. ayandas@umich.edu
authors: Ayan
authors: A
authors: Das
authors: Pallab
authors: P
authors: Bhattacharya
authors: Junseok
authors: J
authors: Heo
authors: Animesh
authors: A
authors: Banerjee
authors: Wei
authors: W
authors: Guo
references: Phys Rev Lett. 1990 Jun 18;64(25):3066-3069
references: 10041886
references: Nano Lett. 2011 Apr 13;11(4):1434-8
references: 21366223
references: Phys Rev Lett. 1993 Mar 1;70(9):1303-1306
references: 10054342
references: Nano Lett. 2010 Sep 8;10(9):3355-9
references: 20701296
references: Science. 2002 Oct 4;298(5591):199-202
references: 12364801
references: Phys Rev Lett. 2007 Mar 23;98(12):126405
references: 17501142
references: Phys Rev Lett. 2006 Jun 16;96(23):230602
references: 16803361
references: Phys Rev A. 1996 Jun;53(6):4250-4253
references: 9913395
references: Nature. 2002 Aug 15;418(6899):751-4
references: 12181559
references: Phys Rev Lett. 1993 Aug 23;71(8):1222-1225
references: 10055481
references: Nature. 2006 Sep 28;443(7110):409-14
references: 17006506
references: Science. 2007 May 18;316(5827):1007-10
references: 17510360
references: Phys Rev Lett. 2011 Aug 5;107(6):066405
references: 21902349
references: Science. 1998 Feb 13;279(5353):1005-7
references: 9461427
references: Phys Rev Lett. 1992 Dec 7;69(23):3314-3317
references: 10046787
references: Phys Rev Lett. 2008 Sep 26;101(13):136409
references: 18851475
references: Proc Natl Acad Sci U S A. 2003 Dec 23;100(26):15318-23
references: 14673089
references: Phys Rev Lett. 2008 Feb 1;100(4):047401
references: 18352332