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

作　　者：Weipeng Chen Wen Huang 

机构地区：[1]Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [2]International Quantum Academy,Shenzhen 518048,China [3]Guangdong Provincial Key Laboratory of Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第8期108-114,共7页中国科学：物理学、力学、天文学（英文版）

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)。

摘　　要：Bloch electrons in multiorbital systems carry quantum geometric information characteristic of their wavevector-dependent interorbital mixing.The geometric nature impacts electromagnetic responses,and this effect carries over to the superconducting state,which receives a geometric contribution to the superfluid weight.In this paper,we show that this contribution could become negative under certain appropriate circumstances.This 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 calculations.The 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.

关 键 词：superconductivity quantum geometry pair density wave superfluid weight FFLO 

分 类 号：O469[理学—凝聚态物理]