论文标题
旋转对称性断裂和高-TC超导体异质结构中的部分主要角度状态
Rotational symmetry breaking and partial Majorana corner states in a high-Tc superconductor based heterostructure
论文作者
论文摘要
通过微观模型，我们从理论上研究了二维拓扑绝缘子（TI）的准粒子激发，与高TC超导体相邻。在动量空间中，Ti层中接近诱导的配对项包括单线通道和三胞胎通道，从而导致能量带的C4旋转对称性断裂和准粒子光谱。对于圆柱几何形状，可能会出现零能边的状态，但它们位于上边界。对于具有开放边界的有限大小系统，上边界上的零能状态消失，Majorana结合状态在两个下角出现。通过探索配对顺序参数和异常绿色功能，可以很好地理解所有结果。
Applying a microscopic model, we study theoretically the quasiparticle excitation of a twodimensional topological insulator (TI) being in proximity to a high-Tc superconductor. In the momentum space, the proximity induced pairing term in the TI layer includes both the singlet channel and triplet channel, leading to the C4 rotational symmetry breaking of the energy bands and the quasiparticle spectra. For a cylinder geometry, the zero energy edge states may appear but they are localized at the upper boundary. For the finite-size system with open boundaries, the zero energy states at the upper boundary disappear and the Majorana bound states emerge at the two lower corners. All of the results can be understood well through exploring the pairing order parameter and the anomalous Green's function.
