Enhanced superconductivity through virtual tunneling in Bernal bilayer graphene coupled to WSe2

被引：28

作者：

Chou, Yang-Zhi ^{[1
,2
]}

Wu, Fengcheng ^{[3
,4
]}

Sarma, Sankar Das ^{[2
]}

机构：

[1] Univ Maryland, Condensed Matter Theory Ctr, College Pk, MD 20742 USA

[2] Univ Maryland, Joint Quantum Inst, Dept Phys, College Pk, MD 20742 USA

[3] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China

[4] Wuhan Inst Quantum Technol, Wuhan 430206, Peoples R China

来源：

PHYSICAL REVIEW B | 2022年 / 106卷 / 18期

基金：

国家重点研发计划;

关键词：

Acknowledgments. We thank Étienne Lantagne-Hurtubise; Alex Thomson; and Cyprian Lewandowski for pointing out an issue in an earlier version of the manuscript. We are also grateful to Seth Davis; Jiabin Yu; and Ming Xie for useful discussions. This work is supported by the Laboratory for Physical Sciences (Y.-Z.C. and S.D.S.); by JQI-NSF-PFC (Y.-Z.C.); and by ARO W911NF2010232 (Y.-Z.C.). F.W. is supported by National Key R&D Program of China 2021YFA1401300 and start-up funding of Wuhan University;

D O I：

10.1103/PhysRevB.106.L180502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Motivated by a recent experiment (Y. Zhang et al., arXiv:2205.05087), we investigate a possible mechanism that enhances superconductivity in hole-doped Bernal bilayer graphene due to a proximate WSe2 monolayer. We show that the virtual tunneling between WSe2 and Bernal bilayer graphene, which is known to induce Ising spin-orbit coupling, can generate an additional attraction between two holes, providing a potential explanation for enhancing superconductivity in Bernal bilayer graphene. Using microscopic interlayer tunneling, we derive the Ising spin-orbit coupling and the effective attraction as functions of the twist angle between Bernal bilayer graphene and the WSe2 monolayer. Our theory provides an intuitive and physical explanation for the intertwined relation between Ising spin-orbit coupling and superconductivity enhancement, which should motivate future studies.

引用

页数：6

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