Drag and critical velocities in a nonresonantly pumped trapped polariton condensate with a rotating defect

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Title:	Drag and critical velocities in a nonresonantly pumped trapped polariton condensate with a rotating defect
Authors:	Cheng, Szu-Cheng Chen, Ting-Wei Jheng, Shih-Da Hsieh, Wen-Feng
Contributors:	物理系
Keywords:	Critical velocity Drag force Exciton-polariton condensate superfluid
Date:	2016-01-19
Issue Date:	2016-03-16 14:19:15 (UTC+8)
Abstract:	We model the superfluid properties of a trapped exciton-polariton condensate under non-resonant excitation subjected to a rotating defect. With increasing the linear velocity of rotating defect, the density modulation can be classified into superfluid-like regime, parabolic-like regime, Cherenkov regime and over-Cherenkov regime. The threshold-like behavior of drag force and the onset of turbulent fringes can define the critical velocity for the superfluidity. Based on the perturbative drag force in the Bogoliubov-type analysis, the rigid modes with gapped excitation spectrum have higher critical velocity than that of the soft modes. (C) 2015 Elsevier Ltd. All rights reserved.
Relation:	SOLID STATE COMMUNICATIONS 卷: 227 頁碼: 45-50
Appears in Collections:	[光電物理系] 期刊論文

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