Twisted Bilayer Graphene: A Phonon-Driven Superconductor

被引：317

作者：

Lian, Biao ^{[1
]}

Wang, Zhijun ^{[2
,3
,4
]}

Bernevig, B. Andrei ^{[5
,6
]}

机构：

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

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

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

[6] Free Univ Berlin, Dahlem Ctr Complex Quantum Syst & Fachbereich Phy, Arnimallee 14, D-14195 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 25期

基金：

美国国家科学基金会;

关键词：

TRANSITION-TEMPERATURE; MOIRE BANDS; GRAPHITE;

D O I：

10.1103/PhysRevLett.122.257002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the electron-phonon coupling in twisted bilayer graphene (TBG), which was recently experimentally observed to exhibit superconductivity around the magic twist angle theta approximate to 1.05 degrees We show that phonon-mediated electron attraction at the magic angle is strong enough to induce a conventional intervalley pairing between graphene valleys K and K' with a superconducting critical temperature T-c similar to 1 K, in agreement with the experiment. We predict that superconductivity can also be observed in TBG at many other angles 9 and higher electron densities in higher moire bands, which may also explain the possible granular superconductivity of highly oriented pyrolytic graphite. We support our conclusions by ab initio calculations.

引用

页数：6

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