Transport Through a Network of Topological Channels in Twisted Bilayer Graphene

被引：134

作者：

Rickhaus, Peter ^{[1
]}

Wallbank, John ^{[2
]}

Slizovskiy, Sergey ^{[3
]}

Pisoni, Riccardo ^{[1
]}

Overweg, Hiske ^{[1
]}

Lee, Yongjin ^{[1
]}

Eich, Marius ^{[1
]}

Liu, Ming-Hao ^{[4
]}

Watanabe, Kenji ^{[5
]}

Taniguchi, Takashi

Ihn, Thomas ^{[1
]}

Ensslin, Klaus ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Dept Phys, Otto Stern Weg 1, CH-8093 Zurich, Switzerland

[2] Ctr Ecol & Hydrol, Maclean Bldg,Benson Lane, Wallingford OX10 8BB, Oxon, England

[3] NRC Kurchatov Inst PNPI, Gatchina 188300, Russia

[4] Natl Cheng Kung Univ, Dept Phys, Tainan 70101, Taiwan

[5] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

来源：

NANO LETTERS | 2018年 / 18卷 / 11期

基金：

瑞士国家科学基金会;

关键词：

Twisted bilayer graphene; topological network; Fabry-Perot; Valleytronics; moire superlattice; quantum valley Hall effect; INTERFERENCE;

D O I：

10.1021/acs.nanolett.8b02387

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We explore a network of electronic quantum valley Hall states in the moire crystal of minimally twisted bilayer graphene. In our transport measurements, we observe Fabry-Perot and Aharanov-Bohm oscillations that are robust in magnetic fields ranging from 0 to 8 T, which is in strong contrast to more conventional two-dimensional systems where trajectories in the bulk are bent by the Lorentz force. This persistence in magnetic field and the linear spacing in density indicate that charge carriers in the bulk flow in topologically protected, one-dimensional channels. With this work, we demonstrate coherent electronic transport in a lattice of topologically protected states.

引用

页码：6725 / 6730

页数：6

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