Low-frequency optical conductivity in graphene and in other scale-invariant two-band systems

被引：63

作者：

Bacsi, Adam ^{[1
]}

Virosztek, Attila ^{[1
,2
]}

机构：

[1] Budapest Univ Technol & Econ, Dept Phys, H-1521 Budapest, Hungary

[2] Wigner Res Ctr Phys, Inst Solid State Phys & Opt, H-1525 Budapest, Hungary

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 12期

基金：

匈牙利科学研究基金会;

关键词：

PHASE-TRANSITIONS; BILAYER GRAPHENE; TRANSPORT; QUANTUM; FILMS;

D O I：

10.1103/PhysRevB.87.125425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate optical transitions of noninteracting electron systems consisting of two symmetric energy bands touching each other at the Fermi energy (e. g., graphene at half-filling). Optical conductivity is obtained using Kubo formula at zero temperature. We show that for particles whose pseudospin direction is determined solely by the direction of their momentum, the optical conductivity has power-law frequency dependence with the exponent (d - 2)/z where d is the dimension of the system and z is the dynamical exponent. According to our result two-dimensional systems with the above pseudospin characteristics always exhibit frequency-independent optical conductivity. DOI: 10.1103/PhysRevB.87.125425

引用

页数：5

共 24 条

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