论文标题
相互作用引起的拓扑相变和低维轨道选择性莫特绝缘子中的Majorana边缘状态
Interaction-induced topological phase transition and Majorana edge states in low-dimensional orbital-selective Mott insulators
论文作者
论文摘要
物质的拓扑阶段是凝结物理学中最有趣的研究方向之一。众所周知，在拓扑绝缘体的表面上诱导的超导性会导致异国情调的主要模式，这是许多提出的量子计算方案的主要成分。在这种情况下，基于铁的高临界温度超导体是一个有前途的平台，可以在实际的凝结物质中托管这种异国情调的现象。库仑相互作用通常被认为对于这些系统的磁性和超导特性至关重要。这项工作桥接了这两个观点，并表明库仑相互作用还可以将具有轨道自由度的规范超导体驱动到拓扑状态。也就是说，我们表明，在哈伯德相互作用的临界值之上，系统同时发展了螺旋旋转顺序，超导性的高度不寻常的三胞胎振幅，以及系统边缘的Majorana fermions。
Topological phases of matter are among the most intriguing research directions in Condensed Matter Physics. It is known that superconductivity induced on a topological insulator's surface can lead to exotic Majorana modes, the main ingredient of many proposed quantum computation schemes. In this context, the iron-based high critical temperature superconductors are a promising platform to host such an exotic phenomenon in real condensed-matter compounds. The Coulomb interaction is commonly believed to be vital for the magnetic and superconducting properties of these systems. This work bridges these two perspectives and shows that the Coulomb interaction can also drive a canonical superconductor with orbital degrees of freedom into the topological state. Namely, we show that above a critical value of the Hubbard interaction the system simultaneously develops spiral spin order, a highly unusual triplet amplitude in superconductivity, and, remarkably, Majorana fermions at the edges of the system.
