Localization Driven Superradiant Instability

The prominent Dicke superradiant phase arises from coupling an ensemble of atoms to a cavity optical field when an external optical pumping exceeds a threshold strength. Here we report a prediction of the superradiant instability driven by Anderson localization, realized with a hybrid system of the...

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Bibliographic Details
Published in:Physical review letters 2020-03, Vol.124 (11), p.113601-113601, Article 113601
Main Authors: Yin, Honghao, Hu, Jie, Ji, An-Chun, Juzeliūnas, Gediminas, Liu, Xiong-Jun, Sun, Qing
Format: Article
Language:English
Subjects:
Anderson localization
Bose-Einstein condensates
Bosons
Hybrid systems
Localization
Optical lattices
Optical pumping
Phase transitions
Stability
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Summary:The prominent Dicke superradiant phase arises from coupling an ensemble of atoms to a cavity optical field when an external optical pumping exceeds a threshold strength. Here we report a prediction of the superradiant instability driven by Anderson localization, realized with a hybrid system of the Dicke and Aubry-André (DAA) model for bosons trapped in a one-dimensional (1D) quasiperiodic optical lattice and coupled to a cavity. Our central finding is that for bosons condensed in a localized phase given by the DAA model, the resonant superradiant scattering is induced, for which the critical optical pumping of the superradiant phase transition approaches zero, giving an instability driven by the Anderson localization. The superradiant phase for the DAA model with or without a mobility edge is investigated, showing that the localization driven superradiant instability is in sharp contrast to the superradiance as widely observed for a Bose-Einstein condensate in extended states, and should be insensitive to the temperature of the system. This study unveils a novel effect of localization on the Dicke superradiance, and is well accessible based on the current experiments.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.113601