Merging of Dirac points in a two-dimensional crystal

被引：312

作者：

Montambaux, G. ^{[1
]}

Piechon, F. ^{[1
]}

Fuchs, J. -N. ^{[1
]}

Goerbig, M. O. ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, Phys Solides Lab, UMR 8502, F-91405 Orsay, France

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.80.153412

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study under which general conditions a pair of Dirac points in the electronic spectrum of a two-dimensional crystal may merge into a single one. The merging signals a topological transition between a semimetallic phase and a band insulator. We derive a universal Hamiltonian that describes the physical properties of the transition, which is controlled by a single parameter, and analyze the Landau-level spectrum in its vicinity. This merging may be observed in the organic salt alpha-(BEDT-TTF)(2)I(3) or in an optical lattice of cold atoms simulating deformed graphene.

引用

页数：4

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