Quantum-Hall to Insulator Transition in Ultra-Low-Carrier-Density Topological Insulator Films and a Hidden Phase of the Zeroth Landau Level

被引：19

作者：

Salehi, Maryam ^{[1
]}

Shapourian, Hassan ^{[2
,3
]}

Rosen, Ilan Thomas ^{[4
,5
]}

Han, Myung-Geun ^{[6
]}

Moon, Jisoo ^{[7
]}

Shibayev, Pavel ^{[7
]}

Jain, Deepti ^{[7
]}

Goldhaber-Gordon, David ^{[5
,8
]}

Oh, Seongshik ^{[7
]}

机构：

[1] Rutgers State Univ, Dept Mat Sci & Engn, Piscataway, NJ 08854 USA

[2] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA

[3] Univ Chicago, Kadanoff Ctr Theoret Phys, Chicago, IL 60637 USA

[4] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[5] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[6] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

[7] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[8] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

来源：

ADVANCED MATERIALS | 2019年 / 31卷 / 36期

基金：

美国国家科学基金会;

关键词：

quantum Hall effect; quantum Hall to insulator transition; scaling analysis; topological insulator thin-films; zeroth Landau level; SURFACE-STATE; LIQUID;

D O I：

10.1002/adma.201901091

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A key feature of the topological surface state under a magnetic field is the presence of the zeroth Landau level at the zero energy. Nonetheless, it is challenging to probe the zeroth Landau level due to large electron-hole puddles smearing its energy landscape. Here, by developing ultra-low-carrier density topological insulator Sb2Te3 films, an extreme quantum limit of the topological surface state is reached and a hidden phase at the zeroth Landau level is uncovered. First, an unexpected quantum-Hall-to-insulator-transition near the zeroth Landau level is discovered. Then, through a detailed scaling analysis, it is found that this quantum-Hall-to-insulator-transition belongs to a new universality class, implying that the insulating phase discovered here has a fundamentally different origin from those in nontopological systems.

引用

页数：7