Ising Superconductivity and Its Hidden Variants  

作　　者：Chong Wang Yong Xu Wenhui Duan 

机构地区：[1]Department of Physics,Carnegie Mellon University,Pittsburgh,Pennsylvania 15213,United States [2]State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics,Tsinghua University,Beijing 100084,China [3]RIKEN Center for Emergent Matter Science(CEMS),Wako,Saitama 351-0198,Japan [4]Frontier Science Center for Quantum Information,Beijing 100084,China [5]State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics and Institute for Advanced Study,Tsinghua University,Beijing 100084,China

出　　处：《Accounts of Materials Research》2021年第7期526-533,共8页材料研究述评（英文）

基　　金：supported by the Basic Science Center Project of NSFC(Grant No.51788104);the Ministry of Science and Technology of China(Grants No.2016YFA0301001,2018YFA0307100,and 2018YFA0305603);the National Science Fund for Distinguished Young Scholars(Grant No.12025405);the National Natural Science Foundation of China(Grant No.11874035);the Beijing Advanced Innovation Center for Future Chip(ICFC).

摘　　要：CONSPECTUS:The magnetic field usually suppresses superconductivity.Especially,at the critical magnetic field,superconductivity is destroyed.Ising superconductivity is a mechanism where the spin−orbit coupling significantly increases the in-plane critical magnetic field in some two-dimensional superconductors.This Account reviews the recent theoretical and experimental research progresses in Ising superconductivity and its variants.For conventional two-dimensional superconductors,the critical inplane magnetic field is known as the Pauli limit.At the critical field,the spin Zeeman energy is comparable to the superconductivity gap and therefore destroys superconductivity.In contrast,in Ising superconductors,the bands are spin-split and the spins are polarized in the out-of-plane direction.These spin-polarized bands compete with external magnetic field such that superconductivity can survive in a magnetic field which is larger than the Pauli limit.Experimentally,Ising superconductivity is first identified in few layer MoS2 and the critical field in some cases is found to be 5 times larger than the Pauli limit.Ising superconductivity originally requires inversion asymmetric systems where bands are spin-split.However,variants of Ising superconductivity can be realized in inversion symmetric materials where the spin−orbit coupling effects are manifested in a more elusive way.In this Account,Ising superconductivity hidden in the real space and Ising superconductivity hidden in the orbital space are reviewed.Ising superconductivity hidden in the real space relies on the fact that some inversion symmetric materials can be divided into two sectors in the real space.The two sectors are both inversion asymmetric and are weakly interacting with each other.Although the bands in these materials are spin degenerate,the spin up and spin down partner of every band reside in different sectors.Since the spin Zeeman interaction is diagonal in sector space,the induced Zeeman splitting is much smaller in these materials than in f

关 键 词：BANDS SUPERCONDUCTIVITY ISING 

分 类 号：O41[理学—理论物理]