Scaling of the Quantum Anomalous Hall Effect as an Indicator of Axion Electrodynamics

被引：71

作者：

Grauer, S. ^{[1
]}

Fijalkowski, K. M. ^{[1
]}

Schreyeck, S. ^{[1
]}

Winnerlein, M. ^{[1
]}

Brunner, K. ^{[1
]}

Thomale, R. ^{[1
]}

Gould, C. ^{[1
]}

Molenkamp, L. W. ^{[1
]}

机构：

[1] Univ Wurzburg, Fac Phys & Astron EP3 & TP1, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 24期

关键词：

FERROMAGNETIC TOPOLOGICAL INSULATOR; STATE; FARADAY; BI2SE3;

D O I：

10.1103/PhysRevLett.118.246801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the scaling behavior of V-doped (Bi, Sb)(2)Te-3 samples in the quantum anomalous Hall regime for samples of various thickness. While previous quantum anomalous Hall measurements showed the same scaling as expected from a two-dimensional integer quantum Hall state, we observe a dimensional crossover to three spatial dimensions as a function of layer thickness. In the limit of a sufficiently thick layer, we find scaling behavior matching the flow diagram of two parallel conducting topological surface states of a three-dimensional topological insulator each featuring a fractional shift of 1/2 e(2)/h in the flow diagram Hall conductivity, while we recover the expected integer quantum Hall behavior for thinner layers. This constitutes the observation of a distinct type of quantum anomalous Hall effect, resulting from 1/2 e(2)/h Hall conductance quantization of three-dimensional topological insulator surface states, in an experiment which does not require decomposition of the signal to separate the contribution of two surfaces. This provides a possible experimental link between quantum Hall physics and axion electrodynamics.

引用

页数：5

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