Magneto-optical and magnetoelectric effects of topological insulators in quantizing magnetic fields

被引：86

作者：

Tse, Wang-Kong ^{[1
]}

MacDonald, A. H. ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 16期

关键词：

GRAPHENE; BI2TE3; PHASE;

D O I：

10.1103/PhysRevB.82.161104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We develop a theory of the magneto-optical and magnetoelectric properties of a topological insulator thin film in the presence of a quantizing external magnetic field. We find that low-frequency magneto-optical properties depend only on the sum of top and bottom surface Dirac-cone filling factors nu(T) and nu(B) whereas the low-frequency magnetoelectric response depends only on the difference. The Faraday rotation is quantized in integer multiples of the fine structure constant and the Kerr effect exhibits a pi/2 rotation. Strongly enhanced cyclotron-resonance features appear at higher frequencies that are sensitive to the filling factors of both surfaces. When the product of the bulk conductivity and the film thickness in e(2)/h units is small compared to alpha, magneto-optical properties are only weakly dependent on accidental doping in the interior of the film.

引用

页数：4

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