Second Thresholds in BEC-BCS-Laser Crossover of Exciton-Polariton Systems

被引:53
|
作者
Yamaguchi, Makoto [1 ]
Kamide, Kenji [1 ]
Nii, Ryota [1 ]
Ogawa, Tetsuo [1 ,2 ]
Yamamoto, Yoshihisa [3 ,4 ]
机构
[1] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan
[2] Osaka Univ, Photon Pioneers Ctr, Suita, Osaka 5650871, Japan
[3] Res Org Informat & Syst, Natl Inst Informat, Chiyoda Ku, Tokyo 1018403, Japan
[4] Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA
关键词
BOSE-EINSTEIN CONDENSATION; SEMICONDUCTOR MICROCAVITY;
D O I
10.1103/PhysRevLett.111.026404
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The mechanism of second thresholds observed in several experiments is theoretically revealed by studying the BEC-BCS-laser crossover in exciton-polariton systems. We find that there are two different types of second thresholds: one is a crossover within quasiequilibrium phases and the other is into nonequilibrium (lasing). In both cases, the light-induced band renormalization causes gaps in the conduction and valence bands, which indicates the existence of bound electron-hole pairs in contrast to earlier expectations. We also show that these two types can be distinguished by the gain spectra.
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页数:5
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