Out-of-equilibrium criticalities in graphene superlattices

被引：40

作者：

Berdyugin, Alexey, I ^{[1
,2
]}

Xin, Na ^{[1
,2
]}

Gao, Haoyang ^{[3
]}

Slizovskiy, Sergey ^{[1
,2
]}

Dong, Zhiyu ^{[3
]}

Bhattacharjee, Shubhadeep ^{[1
,2
]}

Kumaravadivel, P. ^{[1
,2
]}

Xu, Shuigang ^{[1
,2
]}

Ponomarenko, L. A. ^{[1
,4
]}

Holwill, Matthew ^{[1
,2
]}

Bandurin, D. A. ^{[1
,2
]}

Kim, Minsoo ^{[1
,2
]}

Cao, Yang ^{[1
,2
]}

Greenaway, M. T. ^{[5
,6
]}

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

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

Watanabe, K. ^{[7
]}

Taniguchi, T. ^{[8
]}

Fal'ko, V., I ^{[1
,2
,9
]}

Levitov, L. S. ^{[3
]}

Kumar, R. Krishna ^{[1
,2
,10
]}

Geim, A. K. ^{[1
,2
]}

机构：

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

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

[3] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[4] Univ Lancaster, Dept Phys, Lancaster LA1 4YW, England

[5] Loughborough Univ, Dept Phys, Loughborough LE11 3TU, Leics, England

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

[7] Natl Inst Mat Sci, Res Ctr Funct Mat, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

[8] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

[9] Henry Royce Inst Adv Mat, Manchester M13 9PL, Lancs, England

[10] Barcelona Inst Sci & Technol, Inst Ciencies Foton ICF0, Barcelona 08860, Spain

来源：

SCIENCE | 2022年 / 375卷 / 6579期

基金：

英国工程与自然科学研究理事会;

关键词：

ELECTRONIC-PROPERTIES; DIRAC FERMIONS; MOIRE BANDS; SATURATION; STATES;

D O I：

10.1126/science.abi8627

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：

In thermodynamic equilibrium, current in metallic systems is carried by electronic states near the Fermi energy, whereas the filled bands underneath contribute little to conduction. Here, we describe a very different regime in which carrier distribution in graphene and its superlattices is shifted so far from equilibrium that the filled bands start playing an essential role, leading to a critical-current behavior. The criticalities develop upon the velocity of electron flow reaching the Fermi velocity. Key signatures of the out-of-equilibrium state are current-voltage characteristics that resemble those of superconductors, sharp peaks in differential resistance, sign reversal of the Hall effect, and a marked anomaly caused by the Schwinger-like production of hot electron-hole plasma. The observed behavior is expected to be common to all graphene-based superlattices.

引用

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页码：430 / +

页数：28

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