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Possible two-component pairings in electron-doped Bi_2Se_3 based on a tight-binding model

机译：基于紧密绑定模型的电子掺杂Bi_2se_3中可能的双组分配对

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Recent experiments show the spontaneous breaking of rotational symmetry in the superconducting topological insulators MxBi2Se3 (M represents Cu, Sr, or Nd), suggesting that the pairing belongs to a two-dimensional representation of the D-3d symmetry group of the crystal. Motivated by this progress, we construct an exhaustive list of possible two-component pairings of the MxBi2Se3 superconductors, both for the odd-parity E-u representation and for the even-parity E-g representation. Starting from a tight-binding model for the normal phase of Bi2Se3 and MxBi2Se3, we firstly construct the pairing channels in the spin-orbital basis, up to second-nearest-neighbor pairing correlations in the basal plane. We then infer the properties of these pairings by transforming them to the band (pseudospin) basis for the conduction band. A comparison with the experiments leads to several multichannel pairings as promising pairings for MxBi2Se3 superconductors. Besides a nematic and time-reversal symmetric pairing combination, the other pairings that we have identified are chiral and nematic at the same time, which may be nonunitary and have a spontaneous magnetization. A complementary set of experiments are proposed to identify the true pairing symmetries of these superconductors and their evolution with the doping concentration x.
机译：最近的实验表明，超导拓扑绝缘体MXBI2Se3（M表示Cu，Sr或Nd）的旋转对称的自发破裂，表明该配对属于晶体的D-3D对称基团的二维表示。通过这种进步，我们构造了MXBi2Se3超导体的可能的双组分配对的详细列表，用于奇数奇偶校验E-U表示和偶数奇偶校验E-G表示。从BI2SE3和MXBI2SE3的正常相位从紧密绑定模型开始，我们首先在旋转轨道基础上构造配对通道，直到基层中的第二最近邻接配对相关性。然后，我们通过将它们转换为导电带的带（伪旋转）基础来推断这些配对的性质。与实验的比较导致几个多通道配对作为MXBi2Se3超导体的承诺配对。除了向列和时间反转对称配对组合之外，我们已经识别的另一个配对是手性和向列的同时，这可能是不间间的并且具有自发磁化。提出了一种互补的实验，以识别这些超导体的真实配对对称及其与掺杂浓度x的进化。

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  • 来源
    《Physical review》 |2019年第21期|214507.1-214507.15|共15页
  • 作者

    Hao Lei; Ting C. S.;

  • 作者单位

    Southeast Univ Sch Phys Nanjing 211189 Jiangsu Peoples R China;

    Univ Houston Dept Phys Houston TX 77204 USA|Univ Houston Texas Ctr Superconduct Houston TX 77204 USA;

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