Majorana corner modes in a second-order Kitaev spin liquid

被引：44

作者：

Dwivedi, Vatsal ^{[1
]}

Hickey, Ciaran ^{[1
]}

Eschmann, Tim ^{[1
]}

Trebst, Simon ^{[1
]}

机构：

[1] Univ Cologne, Inst Theoret Phys, D-50937 Cologne, Germany

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 05期

关键词：

QUADRUPOLAR FRUSTRATION; TOPOLOGICAL INSULATORS; GROUND-STATE; LATTICE; DYB4;

D O I：

10.1103/PhysRevB.98.054432

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Higher-order topological insulators are distinguished by the existence of topologically protected modes with codimension two or higher. Here, we report the manifestation of a second-order topological insulator in a two dimensional frustrated quantum magnet, which exhibits topological corner modes. Our exactly solvable model is a generalization of the Kitaev honeycomb model to the Shastry-Sutherland lattice that, besides a chiral spin liquid phase, exhibits a gapped spin liquid with Majorana corner modes, which are protected by two mirror symmetries. This second-order Kitaev spin liquid remains stable in the presence of thermal fluctuations and undergoes a finite-temperature phase transition evidenced in large-scale quantum Monte Carlo simulations.

引用

页数：9