Negative local resistance caused by viscous electron backflow in graphene

被引：509

作者：

Bandurin, D. A. ^{[1
]}

Torre, I. ^{[2
]}

Kumar, R. Krishna ^{[1
,3
]}

Ben Shalom, M. ^{[1
,4
]}

Tomadin, A. ^{[5
,6
]}

Principi, A. ^{[7
]}

Auton, G. H. ^{[4
]}

Khestanova, E. ^{[1
,4
]}

Novoselov, K. S. ^{[4
]}

Grigorieva, I. V. ^{[1
]}

Ponomarenko, L. A. ^{[1
,3
]}

Geim, A. K. ^{[1
]}

Polini, M. ^{[8
]}

机构：

[1] Univ Manchester, Sch Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England

[2] Scuola Normale Super Pisa, Natl Enterprise NanoSci & NanoTechnol, Piazza Cavalieri 7, I-56126 Pisa, Italy

[3] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

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

[5] CNR, Ist Nanosci, Natl Enterprise NanoSci & NanoTechnol, I-56126 Pisa, Italy

[6] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy

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

[8] Ist Italiano Tecnol, Graphene Labs, Via Morego 30, I-16163 Genoa, Italy

来源：

SCIENCE | 2016年 / 351卷 / 6277期

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

TEMPERATURE;

D O I：

10.1126/science.aad0201

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：

Graphene hosts a unique electron system in which electron-phonon scattering is extremely weak but electron-electron collisions are sufficiently frequent to provide local equilibrium above the temperature of liquid nitrogen. Under these conditions, electrons can behave as a viscous liquid and exhibit hydrodynamic phenomena similar to classical liquids. Here we report strong evidence for this transport regime. We found that doped graphene exhibits an anomalous (negative) voltage drop near current-injection contacts, which is attributed to the formation of submicrometer-size whirlpools in the electron flow. The viscosity of graphene's electron liquid is found to be similar to 0.1 squaremeters per second, an order of magnitude higher than that of honey, in agreement with many-body theory. Our work demonstrates the possibility of studying electron hydrodynamics using high-quality graphene.

引用

页码：1055 / 1058

页数：4

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