標題: Collective excitations, Nambu-Goldstone modes, and instability of inhomogeneous polariton condensates
作者: Chen, Ting-Wei
Cheng, Szu-Cheng
Hsieh, Wen-Feng
光電工程學系
Department of Photonics
公開日期: 8-Nov-2013
摘要: We study nonequilibrium polariton condensates in a harmonic potential trap. After finding the steady-state density and supercurrent distributions of nonequilibrium condensates, we calculate the collective excitations of the system. From collective excitation spectra, we can identify the bifurcation of the stable and unstable modes in terms of the pumping spot size and power. There exist Nambu-Goldstone modes that reveal the pattern of the spontaneous symmetry breaking of the system. Moreover, the unstable mechanism associated with the inward supercurrent flow is characterized by the existence of a supersonic region within the condensate.
URI: http://dx.doi.org/10.1103/PhysRevB.88.184502
http://hdl.handle.net/11536/23269
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.88.184502
期刊: PHYSICAL REVIEW B
Volume: 88
Issue: 18
結束頁: 
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