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

作     者：Dongyang Yu Jian-Song Pan Xiong-Jun Liu Wei Zhang Wei Yi 

作者机构：Department of Physics Renmin University of China Beijing 100872 China Key Laboratory of Quantum Inforraation University of Science and Technology of China CAS Hefei 230026 China Synergetic innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of China Beijing 100872 China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2018年第13卷第1期

页      面：129-141页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the National Key Basic Research Program the National Key R&D Program 国家自然科学基金 the Research Funds of Renmin University of China support from the Strategic Priority Research Program (B) of the Chinese Academy of Sciences supported by the Ministry of Science & Technology the Thousand-Young-Talent Program of China 

主　　题：superradiance topological phase Fermi gas cavity QED 

摘      要：Coherently driven atomic gases inside optical cavities hold great promise for generating rich dynam- ics 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.