Topological superradiant state in Fermi gases with cavity induced spin–orbit coupling

doi:10.1007/s11467-017-0695-5

Front. Phys.

2018, Vol. 13

Issue (1) : 136701 https://doi.org/10.1007/s11467-017-0695-5

RESEARCH ARTICLE

Topological superradiant state in Fermi gases with cavity induced spin–orbit coupling

Dongyang Yu¹, Jian-Song Pan^2,³, Xiong-Jun Liu^4,⁵(

), Wei Zhang^1,⁶(

), Wei Yi^2,³(

)

¹. Department of Physics, Renmin University of China, Beijing 100872, China
². Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China
³. Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
⁴. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
⁵. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
⁶. Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China

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Abstract

Coherently driven atomic gases inside optical cavities hold great promise for generating rich dynamics and exotic states of matter. It was shown recently that an exotic topological superradiant state exists in a two-component degenerate Fermi gas coupled to a cavity, where local order parameters coexist with global topological invariants. In this work, we characterize in detail various properties of this exotic state, focusing on the feedback interactions between the atoms and the cavity field. In particular, we demonstrate that cavity-induced interband coupling plays a crucial role in inducing the topological phase transition between the conventional and topological superradiant states. We analyze the interesting signatures in the cavity field left by the closing and reopening of the atomic bulk gap across the topological phase boundary and discuss the robustness of the topological superradiant state by investigating the steady-state phase diagram under various conditions. Furthermore, we consider the interaction effect and discuss the interplay between the pairing order in atomic ensembles and the superradiance of the cavity mode. Our work provides many valuable insights into the unique cavity– atom hybrid system under study and is helpful for future experimental exploration of the topological superradiant state.

Keywords superradiance topological phase Fermi gas cavity QED

Corresponding Author(s): Xiong-Jun Liu,Wei Zhang,Wei Yi

Issue Date: 07 September 2017

Cite this article:

Dongyang Yu,Jian-Song Pan,Xiong-Jun Liu, et al. Topological superradiant state in Fermi gases with cavity induced spin–orbit coupling[J]. Front. Phys. , 2018, 13(1): 136701.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-017-0695-5
https://academic.hep.com.cn/fop/EN/Y2018/V13/I1/136701

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