时间反演对称性破缺的笼目超导输运现象
Transport phenomena in time-reversal symmetry-breaking Kagome superconductors
杨硕颖 1殷嘉鑫1
作者信息
- 1. 南方科技大学物理系,深圳 518055
- 折叠
摘要
近期对钒基笼目超导体(AV3Sb5,A=K,Cs,Rb)家族中三种材料的低温量子输运测量均显示出时间反演对称性破缺的超导态.其中,在Nb/K1-xV3Sb/Nb的约瑟夫森结和RbV3Sb5 中,超导转变温度以下的磁阻随磁场扫动方向存在磁滞现象;CsV3Sb5 中存在零磁场下的超导二极管现象,即正向和反向的超导临界电流大小不同.首先,本文讨论了这些实验现象的区别和联系.然后,讨论产生上述非常规超导输运现象的可能机理,如手性超导序参量(d+id或p+ip),以及由电荷密度波与常规超导态耦合产生的手性配对密度波.
Abstract
Recent studies have found that all three materials within the vanadium-based Kagome superconductors(AV3Sb5,A=K,Cs,Rb)exhibit time-reversal symmetry-breaking behaviors in the superconducting states.Among the three,the Josephson junctions structured Nb/K1-xV3Sb5/Nb and RbV3Sb5 show magnetic hysteresis below the superconducting transition temperature.In CsV3Sb5,there exists a zero-field superconducting diode effect,meaning the magnitude of the positive and negative superconducting critical current are different.We first discuss the similarities and differences among the three above-mentioned experiments.Then,we discuss the possible mechanisms responsible for the unconventional superconducting transport phenomena:such as chiral superconducting order parameter(d+id or p+ip),and chiral pair density waves arising from the coupling of the charge density waves and conventional superconducting states.
关键词
笼目超导体/对称性破缺/超导二极管Key words
Kagome superconductor/symmetry-breaking/superconducting diode引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据