论文标题
粒子孔光谱不对称，在多边非中心超对象的边缘
Particle-hole spectral asymmetry at the edge of multiorbital noncentrosymmetric superconductors
论文作者
论文摘要
Bogoliubov准粒子是一种连贯的电子孔量子叠加，通常对于时间反转的对称超导体，具有粒子 - 孔对称性的光谱分布。在这里，我们证明，在二维非中心对称超导体中，具有多纤维自旋 - 三旋转的超导体，将状态在边缘密度的能量曲线配对可以违反该范式。我们表明，Andreev反射的结构通常会导致由轨道上的构成态制成的配对状态，这些状态由于边缘处的晶体对称性程度低而呈轨道分裂。所得的配对状态在轨道部门具有混合的平等性特征，在边缘处降低的晶体对称性的情况下，为光谱函数介绍了粒子孔不对称的轮廓。这些发现表明，在具有轨道自由度和时间反转对称性的超导体边缘设计不对称光谱函数的途径。可以利用新兴的特征来检测配备内部自由度的自旋三型配对。
Bogoliubov quasiparticles are a coherent electron-hole quantum superposition which typically, for time-reversal symmetric superconductors, exhibit a spectral distribution with particle-hole symmetry. Here, we demonstrate that in two-dimensional noncentrosymmetric superconductors with multiorbital spin-triplet pairing the energy profile of the density of states at the edge can violate this paradigm. We show that the structure of Andreev reflections generally leads to pairing states made of configurations that are orbitally split due to the low degree of crystalline symmetry at the edge. The resulting pairing state has a mixed parity character in the orbital sector that, in the presence of reduced crystal symmetry at the edge, sets out a particle-hole asymmetric profile for the spectral function. These findings indicate a path to design asymmetric spectral functions at the edge of superconductors with orbital degrees of freedom and time-reversal symmetry. The emerging signatures can be exploited for the detection of spin-triplet pairing equipped with internal degrees of freedom.
