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From a semimetal to a chiral Fulde-Ferrell superfluid

机译：从半金属到手性Fulde-Ferrell超流体

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摘要

The recent realization of two-dimensional (2D) synthetic spin-orbit (SO) coupling opens a broad avenue to explore novel topological states for ultracold atoms. Here, we propose a scheme to realize chiral Fulde-Ferrell superfluid for ultracold fermions, and show a generic theory that the topology of chiral superfluid phases can be uniquely determined from the normal states. The main findings are twofold. First, a semimetal is driven by a type of 2D SO coupling, and can be tuned into massive Dirac fermion phase with or without inversion symmetry. Without inversion symmetry, the superfluid phase of nonzero pairing momentum is favored under an attractive interaction. Furthermore, we show a fundamental theorem that the Chern number of a 2D chiral superfluid can be obtained from the 1D invariants of Fermi surfaces, with which the chiral Fulde-Ferrell superfluid with a broad topological region is predicted. This generic theorem is also useful for condensed-matter physics and material science in the search for new topological superconductors.
机译：二维（2D）合成自旋轨道（SO）耦合的最新实现为探索超冷原子的新型拓扑状态开辟了广阔的途径。在这里，我们提出了一种实现超冷费米子手性Fulde-Ferrell超流体的方案，并展示了一个通用理论，即可以从正常状态唯一确定手性超流体相的拓扑。主要发现有两个方面。首先，半金属是由一种2D SO耦合驱动的，可以将其调谐成具有或不具有反对称性的块状狄拉克费米子相。如果没有反对称性，则在吸引作用下会优先考虑非零配对动量的超流体相。此外，我们显示了一个基本定理，即可以从费米表面的一维不变量获得2D手性超流体的Chern数，并据此预测具有较宽拓扑区域的手性Fulde-Ferrell超流体。在寻找新的拓扑超导体时，该通用定理对于凝聚态物理和材料科学也很有用。

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  • 来源
    《Physical review》 |2018年第2期|020501.1-020501.5|共5页
  • 作者

    Ting Fung Jeffrey Poon; Xiong-Jun Liu;

  • 作者单位

    International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China,Collaborative Innovation Center of Quantum Matter, Beijing 100871, China;

    International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China,Collaborative Innovation Center of Quantum Matter, Beijing 100871, China,CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China,Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China;

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