科学通报(英文版)2024，Vol.69Issue(3) ：319-324.DOI:10.1016/j.scib.2023.12.005

Robust topological superconductivity in spin-orbit coupled systems at higher-order van Hove filling

Xinloong Han Jun Zhan Fu-Chun Zhang Jiangping Hu Xianxin Wu
科学通报(英文版)2024，Vol.69Issue(3) ：319-324.DOI:10.1016/j.scib.2023.12.005
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Robust topological superconductivity in spin-orbit coupled systems at higher-order van Hove filling

Xinloong Han 1Jun Zhan 2Fu-Chun Zhang 1Jiangping Hu 3Xianxin Wu4
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作者信息

  • 1. Kavli Institute for Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China
  • 2. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China
  • 3. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Kavli Institute for Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China
  • 4. CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China
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Abstract

Van Hove singularities in proximity to the Fermi level promote electronic interactions and generate diverse competing instabilities.It is also known that a nontrivial Berry phase derived from spin-orbit coupling can introduce an intriguing decoration into the interactions and thus alter correlated phenom-ena.However,it is unclear how and what type of new physics can emerge in a system featured by the interplay between van Hove singularities(VHSs)and the Berry phase.Here,based on a general Rashba model on the square lattice,we comprehensively explore such an interplay and its significant influence on the competing electronic instabilities by performing a parquet renormalization group analysis.Despite the existence of a variety of comparable fluctuations in the particle-particle and particle-hole channels associated with higher-order VHSs,we find that the chiral p±ip pairings emerge as two stable fixed tra-jectories within the generic interaction parameter space,namely the system becomes a robust topolog-ical superconductor.The chiral pairings stem from the hopping interaction induced by the nontrivial Berry phase.The possible experimental realization and implications are discussed.Our work sheds new light on the correlated states in quantum materials with strong spin-orbit coupling(SOC)and offers fresh insights into the exploration of topological superconductivity.

Key words

Van Hove singularity/Topological superconductors/Berry phase/spin-orbit coupling

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基金项目

Ministry of Science and Technology(2022YFA1403901)

National Natural Science Foundation of China(11920101005)

National Natural Science Foundation of China(11888101)

National Natural Science Foundation of China(12047503)

Jiangping Hu also acknowledges the New Cornerstone Investigator Program()

Fu-Chun Zhang is also partially supported by Chinese Academy of Sciences(JZHKYPT-2021-08)

China Postdoctoral Science Foundation Fellowship(2022M723112)

出版年

2024
科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
参考文献量47
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