Giant Nonlocality Near the Dirac Point in Graphene

被引：218

作者：

Abanin, D. A. ^{[2
,3
,4
]}

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

Ponomarenko, L. A. ^{[2
]}

Gorbachev, R. V. ^{[2
]}

Mayorov, A. S. ^{[2
]}

Katsnelson, M. I. ^{[5
]}

Watanabe, K. ^{[6
]}

Taniguchi, T. ^{[6
]}

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

Levitov, L. S. ^{[1
]}

Geim, A. K. ^{[2
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

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

[3] Princeton Univ, Princeton Ctr Theoret Sci, Princeton, NJ 08544 USA

[4] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[5] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands

[6] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[7] Russian Acad Sci, Inst Microelect Technol, Chernogolovka 142432, Russia

来源：

SCIENCE | 2011年 / 332卷 / 6027期

基金：

英国工程与自然科学研究理事会;

关键词：

TRANSPORT;

D O I：

10.1126/science.1199595

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：

Transport measurements have been a powerful tool for discovering electronic phenomena in graphene. We report nonlocal measurements performed in the Hall bar geometry with voltage probes far away from the classical path of charge flow. We observed a large nonlocal response near the Dirac point in fields as low as 0.1 tesla, which persisted up to room temperature. The nonlocality is consistent with the long-range flavor currents induced by the lifting of spin/valley degeneracy. The effect is expected to contribute strongly to all magnetotransport phenomena near the neutrality point.

引用

页码：328 / 330

页数：3

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