Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures

被引：71

作者：

Wallbank, J. R. ^{[1
,2
]}

Ghazaryan, D. ^{[2
]}

Misra, A. ^{[2
]}

Cao, Y. ^{[3
]}

Tu, J. S. ^{[3
]}

Piot, B. A. ^{[4
]}

Potemski, M. ^{[4
]}

Pezzini, S. ^{[5
,6
]}

Wiedmann, S. ^{[5
,6
]}

Zeitler, U. ^{[5
,6
]}

Lane, T. L. M. ^{[1
,2
]}

Morozov, S. V. ^{[2
,7
,8
]}

Greenaway, M. T. ^{[9
]}

Eaves, L. ^{[2
,9
]}

Geim, A. K.

Fal'ko, V. I. ^{[1
,2
]}

Novoselov, K. S. ^{[1
,2
]}

Mishchenko, A. ^{[1
,2
]}

机构：

[1] Univ Manchester, Natl Graphene Inst, Manchester M13 9PL, Lancs, England

[2] Univ Manchester, Sch Phys & Astron, Manchester M13 9PL, Lancs, England

[3] Univ Manchester, Ctr Mesosci & Nanotechnol, Manchester M13 9PL, Lancs, England

[4] LNCMI CNRS UGA UPS INSA EMFL, Lab Natl Champs Magnet Intenses, 25 Ave Martyrs, F-38042 Grenoble, France

[5] Radboud Univ Nijmegen, EMFL, High Field Magnet Lab, NL-6525 ED Nijmegen, Netherlands

[6] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 ED Nijmegen, Netherlands

[7] RAS, Inst Microelect Technol & High Pur Mat, Chernogolovka 142432, Russia

[8] Natl Univ Sci & Technol MISiS, Leninsky Pr 4, Moscow 119049, Russia

[9] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

来源：

SCIENCE | 2016年 / 353卷 / 6299期

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会; 俄罗斯基础研究基金会;

关键词：

GRAPHENE HETEROSTRUCTURES; TOPOLOGICAL INSULATORS; SPECTROSCOPY; FERMIONS;

D O I：

10.1126/science.aaf4621

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Chirality is a fundamental property of electrons with the relativistic spectrum found in graphene and topological insulators. It plays a crucial role in relativistic phenomena, such as Klein tunneling, but it is difficult to visualize directly. Here, we report the direct observation and manipulation of chirality and pseudospin polarization in the tunneling of electrons between two almost perfectly aligned graphene crystals. We use a strong in-plane magnetic field as a tool to resolve the contributions of the chiral electronic states that have a phase difference between the two components of their vector wave function. Our experiments not only shed light on chirality, but also demonstrate a technique for preparing graphene's Dirac electrons in a particular quantum chiral state in a selected valley.

引用

页码：575 / 579

页数：5

共 30 条

[1] Tunneling spectroscopy of graphene-boron-nitride heterostructures [J].