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arXiv 1309.3012cond-mat.quant-gas
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具有谐振势阱的微腔极化激元凝聚的Phase diagram

Phase diagram of microcavity polariton condensates with a harmonic potential trap

Ting-Wei Chen, Min g-Dar Wei, Szu-Cheng Cheng, Wen-Feng Hsieh

摘要:

从理论上研究了在不同泵浦条件下非均匀激子-极化激元凝聚体的相变。通过对复Gross-Pitaevskii方程的径向对称解的Bogoliubov激励,我们不仅确定了由流体可压缩性符号决定的稳定模和不稳定模的分叉,而且确定了由基元激励和单量子涡旋稳定性表征的两种不同的稳定模.一种是具有Goldstone平坦色散的准凝聚BKT相,另一种是具有线性色散的局域BEC相,在零动量时具有激发能隙。

英文摘要:

We theoretically explore the phase transition in inhomogeneous exciton-polariton condensates with variable pumping conditions. Through Bogoliubov excitations to the radial-symmetric solutions of complex Gross-Pitaevskii equation, we determine not only the bifurcation of stable and unstable modes by the sign of fluid compressibility but also two distinct stable modes which are characterized by the elementary excitations and the stability of singly quantized vortex. One state is the quasi-condensate BKT phase with Goldstone flat dispersion; the other state is the localized-BEC phase which exhibits linear-type dispersion and has an excitation energy gap at zero momentum.

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