Topological Superradiant States in a Degenerate Fermi Gas.
Topological Superradiant States in a Degenerate Fermi Gas.
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DOI：
10.1103/physrevlett.115.045303
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发表时间：
2014-10
影响因子：
8.6
通讯作者：
Jian-Song Pan;Xiong-Jun Liu;Wei Zhang;W. Yi;G. Guo
中科院分区：
文献类型：
--
作者：
Jian-Song Pan;Xiong-Jun Liu;Wei Zhang;W. Yi;G. Guo
我们预言了腔中两组分简并费米气体中拓扑超辐射态的存在。在横向驱动腔模中产生的超辐射光诱导了腔辅助的自旋轨道耦合，并在半填充时打开了体隙。这种机制可以同时驱动系统中的拓扑相变，产生拓扑超辐射态。我们绘制出的稳态相图中存在的有效塞曼场，并确定一个关键的四临界点，超过该点的拓扑和传统的superradiant相边界分离。拓扑相变可以从原子的动量分布或由于原子对腔场的非平凡反馈引起的腔光子占据的变化中检测到。
We predict the existence of a topological superradiant state in a two-component degenerate Fermi gas in a cavity. The superradiant light generation in the transversely driven cavity mode induces a cavity-assisted spin-orbit coupling and opens a bulk gap at half filling. This mechanism can simultaneously drive a topological phase transition in the system, yielding a topological superradiant state. We map out the steady-state phase diagram in the presence of an effective Zeeman field, and identify a critical tetracritical point beyond which the topological and the conventional superraidiant phase boundaries separate. The topological phase transition can be detected from its signatures in either the momentum distribution of the atoms or the variation of the cavity photon occupation due to the nontrivial feedback of the atoms on the cavity field.