一种实用的可交互拓扑相的新平台
Practical new platform for interaction-enabled topological phases
摘要：
强相互作用的粒子系统，费米子或玻色子，可以产生拓扑相，这是不可能实现的非相互作用系统。许多这样的相互作用，使拓扑相位已被理论上讨论，但很少有实验实现存在。在这里，我们提出了一个新的平台，相互作用的费米子的拓扑相位与时间反演对称性$\bar T$（这样$\bar T^2=1$），可以实现在涡旋晶格中的表面状态的拓扑绝缘体。组成粒子是马约拉纳费米子绑定到这样的晶格的涡旋和反涡旋。我们解释了如何产生的$\bar T$对称性，并讨论了如何在相互作用可以通过实验调整和检测。我们展示了如何利用这些功能来实现一类相互作用使晶体拓扑相，在弱相互作用系统中没有类似物。
英文摘要：
Systems of strongly interacting particles, fermions or bosons, can give rise to topological phases that are not acessible to non-interacting systems. Many such interaction-enabled topological phases have been discussed theoretically but few experimental realizations exists. Here we propose a new platform for interacting topological phases of fermions with time reversal symmetry $\bar T$ (such that $\bar T^2=1$) that can be realized in vortex lattices in the surface state of a topological insulator. The constituent particles are Majorana fermions bound to vortices and antivortices of such a lattice. We explain how the $\bar T$ symmetry arises and discuss ways in which interactions can be experimentally tuned and detected. We show how these features can be exploited to realize a class of interaction-enabled crystalline topological phases that have no analog in weakly interacting systems.
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