Topological Superconductivity in Twisted Multilayer Graphene

被引：381

作者：

Xu, Cenke ^{[1
]}

Balents, Leon ^{[2
]}

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 08期

基金：

美国国家科学基金会;

关键词：

T-J MODEL; PAIRING SYMMETRY;

D O I：

10.1103/PhysRevLett.121.087001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study a minimal Hubbard model for electronically driven superconductivity in a correlated flat miniband resulting from the superlattice modulation of a twisted graphene multilayer. The valley degree of freedom drastically modifies the nature of the preferred pairing states, favoring spin triplet d + id order with a valley singlet structure. We identify two candidates in this class, which are both topological superconductors. These states support half-vortices carrying half the usual superconducting flux quantum hc/(4e), and have topologically protected gapless edge states.

引用

页数：5

共 38 条

[1] Moire bands in twisted double-layer graphene [J].

Bistritzer, Rafi ;

MacDonald, Allan H. .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2011, 108 (30) :12233-12237

[2] Correlated insulator behaviour at half-filling in magic-angle graphene superlattices [J].

Cao, Yuan ;

Fatemi, Valla ;

Demir, Ahmet ;

Fang, Shiang ;

Tomarken, Spencer L. ;

Luo, Jason Y. ;

Sanchez-Yamagishi, Javier D. ;

Watanabe, Kenji ;

Taniguchi, Takashi ;

Kaxiras, Efthimios ;

Ashoori, Ray C. ;

Jarillo-Herrero, Pablo .

NATURE, 2018, 556 (7699) :80-+

[3] Unconventional superconductivity in magic-angle graphene superlattices [J].

Cao, Yuan ;

Fatemi, Valla ;

Fang, Shiang ;

Watanabe, Kenji ;

Taniguchi, Takashi ;

Kaxiras, Efthimios ;

Jarillo-Herrero, Pablo .

NATURE, 2018, 556 (7699) :43-+

[4]

Chen G., ARXIV180301985

[5] Unconventional superconductivity on the triangular lattice Hubbard model [J].

Chen, Kuang Shing ;

Meng, Zi Yang ;

Yu, Unjong ;

Yang, Shuxiang ;

Jarrell, Mark ;

Moreno, Juana .

PHYSICAL REVIEW B, 2013, 88 (04)

[6] Numerical studies of confined states in rotated bilayers of graphene [J].

de Laissardiere, G. Trambly ;

Mayou, D. ;

Magaud, L. .

PHYSICAL REVIEW B, 2012, 86 (12)

[7] Electronic structure theory of weakly interacting bilayers [J].

Fang, Shiang ;

Kaxiras, Efthimios .

PHYSICAL REVIEW B, 2016, 93 (23)

[8] Topological phases of fermions in one dimension [J].

Fidkowski, Lukasz ;

Kitaev, Alexei .

PHYSICAL REVIEW B, 2011, 83 (07)

[9] Effects of interactions on the topological classification of free fermion systems [J].

Fidkowski, Lukasz ;

Kitaev, Alexei .

PHYSICAL REVIEW B, 2010, 81 (13)

[10] Two-orbital SU(N) magnetism with ultracold alkaline-earth atoms [J].

Gorshkov, A. V. ;

Hermele, M. ;

Gurarie, V. ;

Xu, C. ;

Julienne, P. S. ;

Ye, J. ;

Zoller, P. ;

Demler, E. ;

Lukin, M. D. ;

Rey, A. M. .

NATURE PHYSICS, 2010, 6 (04) :289-295

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