Pair density wave facilitated by Bloch quantum geometry in nearly flat band multiorbital superconductors

作     者：Weipeng Chen Wen Huang 

作者机构：Shenzhen Institute for Quantum Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China International Quantum AcademyShenzhen 518048China Guangdong Provincial Key Laboratory of Quantum Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2023年第66卷第8期

页      面：108-114页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.11904155) the Guangdong Provincial Key Laboratory(Grant No.2019B121203002) the Guangdong Science and Technology Department(Grant No.2022A1515011948) the Shenzhen Science and Technology Program(Grant No.KQTD20200820113010023) 

主　　题：superconductivity quantum geometry pair density wave superfluid weight FFLO 

摘      要：Bloch electrons in multiorbital systems carry quantum geometric information characteristic of their wavevector-dependent interorbital *** geometric nature impacts electromagnetic responses,and this effect carries over to the superconducting state,which receives a geometric contribution to the superfluid *** this paper,we show that this contribution could become negative under certain appropriate *** may facilitate the stabilization of Cooper pairings with real space phase modulation,i.e.,the pair density wave order,as we demonstrate through two-orbital model Bogoliubov de-Gennes mean-field *** quantum geometric effect therefore constitutes an intrinsic mechanism for the formation of such a novel phase of matter in the absence of external magnetic field.