室温极化激元激光器中的自发极化积累。

Spontaneous polarization buildup in a room-temperature polariton laser.

作者信息

Baumberg J J, Kavokin A V, Christopoulos S, Grundy A J D, Butté R, Christmann G, Solnyshkov D D, Malpuech G, von Högersthal G Baldassarri Höger, Feltin E, Carlin J-F, Grandjean N

机构信息

NanoPhotonics Centre, Department of Physics, University of Cambridge, Cambridge, CB3 0HE, United Kingdom.

出版信息

Phys Rev Lett. 2008 Sep 26;101(13):136409. doi: 10.1103/PhysRevLett.101.136409.

DOI:10.1103/PhysRevLett.101.136409

PMID:18851475

Abstract

We observe the buildup of strong (approximately 50%) spontaneous vector polarization in emission from a GaN-based polariton laser excited by short optical pulses at room temperature. The Stokes vector of emitted light changes its orientation randomly from one excitation pulse to another, so that the time-integrated polarization remains zero. This behavior is completely different from any previous laser. We interpret this observation in terms of the spontaneous symmetry breaking in a Bose-Einstein condensate of exciton polaritons.

摘要

我们观察到，在室温下由短光脉冲激发的基于氮化镓的极化激元激光器的发射中，出现了强烈的（约50%）自发矢量极化的积累。发射光的斯托克斯矢量在不同的激发脉冲之间随机改变其方向，因此时间积分极化始终为零。这种行为与之前的任何激光器完全不同。我们根据激子极化激元玻色 - 爱因斯坦凝聚中的自发对称性破缺来解释这一观察结果。