Observation of the Quantum Hall Effect in Confined Films of the Three-Dimensional Dirac Semimetal Cd3As2

被引：153

作者：

Schumann, Timo ^{[1
]}

Galletti, Luca ^{[1
]}

Kealhofer, David A. ^{[2
]}

Kim, Honggyu ^{[1
]}

Goyal, Manik ^{[1
]}

Stemmer, Susanne ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Mat Dept, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 01期

基金：

美国国家科学基金会;

关键词：

SURFACE FERMI ARCS; TOPOLOGICAL INSULATOR; THIN-FILMS; CHARGE; PHASE;

D O I：

10.1103/PhysRevLett.120.016801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetotransport properties of epitaxial films of Cd3As2, a paradigm three-dimensional Dirac semimetal, are investigated. We show that an energy gap opens in the bulk electronic states of sufficiently thin films and, at low temperatures, carriers residing in surface states dominate the electrical transport. The carriers in these states are sufficiently mobile to give rise to a quantized Hall effect. The sharp quantization demonstrates surface transport that is virtually free of parasitic bulk conduction and paves the way for novel quantum transport studies in this class of topological materials. Our results also demonstrate that heterostructuring approaches can be used to study and engineer quantum states in topological semimetals.

引用

页数：5

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