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

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

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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.

Van Hove singularityTopological superconductorsBerry phasespin-orbit coupling

Xinloong Han、Jun Zhan、Fu-Chun Zhang、Jiangping Hu、Xianxin Wu

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Kavli Institute for Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China

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

CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China

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Ministry of Science and TechnologyNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaJiangping Hu also acknowledges the New Cornerstone Investigator ProgramFu-Chun Zhang is also partially supported by Chinese Academy of SciencesChina Postdoctoral Science Foundation Fellowship

2022YFA1403901119201010051188810112047503JZHKYPT-2021-082022M723112

2024

10.1016/j.scib.2023.12.005

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(3)
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