Quantum anomalous Hall states in the p-orbital honeycomb optical lattices

被引：54

作者：

Zhang, Machi ^{[1
,2
]}

Hung, Hsiang-hsuan ^{[1
]}

Zhang, Chuanwei ^{[3
]}

Wu, Congjun ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Phys, San Diego, CA 92093 USA

[2] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[3] Washington State Univ, Dept Phys & Astron, Pullman, WA 99164 USA

来源：

PHYSICAL REVIEW A | 2011年 / 83卷 / 02期

基金：

美国国家科学基金会;

关键词：

SINGLE DIRAC CONE; TOPOLOGICAL-INSULATOR; REALIZATION; ATOMS; PHASES;

D O I：

10.1103/PhysRevA.83.023615

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the quantum anomalous Hall states in the p-orbital bands of the honeycomb optical lattices loaded with single-component fermions. Such an effect has not yet been realized in both condensed-matter and cold-atom systems. By applying the available experimental techniques to rotate each lattice site around its own center, the band structures become topologically nontrivial. At a certain rotation angular velocity Omega, a flat band structure appears with localized eigenstates carrying chiral current moments. By imposing the soft confining potential, the density profile exhibits a wedding-cake-shaped distribution with insulating plateaus at commensurate fillings. Moreover, the inhomogeneous confining potential induces dissipationless circulation currents, the magnitudes and chiralities of which vary with the distance from the trap center. In the insulating regions, the Hall conductances are quantized, and in the metallic regions, the directions and magnitudes of chiral currents can not be described by the usual local-density approximation. The quantum anomalous Hall effects are robust at temperature scales that are small compared to band gaps, which increase the feasibility of experimental realizations.

引用

页数：13

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