Chern insulators in singular geometries

Article

关键词: INCOMPRESSIBLE QUANTUM FLUID;    QUANTIZED HALL CONDUCTANCE;    HALDANE MODEL;    LANDAU-LEVELS;    EDGE STATES;    EXCITATIONS;    POLYACETYLENE;    REALIZATION;   

DOI  :  10.1103/PhysRevB.97.045126

来源: SCIE

【 摘 要 】

Topological quantum states have been proposed and investigated on two-dimensional flat surfaces or lattices with different geometries like the plane, cylinder, and torus. Here, we study quantum anomalous Hall (QAH) or Chern insulator (CI) states on two-dimensional singular surfaces (such as conical and helicoidlike surfaces). Such singular geometries can be constructed based on the disk geometry and a defined unit sector with n-fold rotational symmetry. The singular geometry induces exotic and intriguing features of CI/QAH states, such as in-gap and in-band core states, charge fractionalization, and multiple branches of edge excitations.

【 授权许可】

Free