摘要
Kagome材料为研究电子关联效应、拓扑物态、非常规超导电性和几何阻挫等新奇物理现象提供了良好的平台.最近,Kagome超导体AV3Sb5(A = K,Rb,Cs)在凝聚态物理领域引起了广泛关注和研究,国内外多个课题组通过化学掺杂对其物性进行有效调控,为进一步理解和认识该体系材料提供了巨大帮助.本文综述了AV3Sb5 掺杂研究的最新进展,对这一快速发展材料体系的掺杂效应进行了总结,以促进Kagome超导体AV3Sb5 的进一步探索和研究.具体地说,回顾了CsV3Sb5 中Nb,Ta,Ti和Sn的原子掺杂,以及Cs,O等元素表面掺杂对材料量子效应和电子能带结构的影响,讨论了掺杂对物性调控的物理机制.为进一步理解和研究该材料体系的电荷密度波、时间反演对称性破缺、超导电性等丰富量子效应提供相关基础.
Abstract
Material with Kagome lattice provides an excellent platform for studying electronic correlation effects,topological states of matter,unconventional superconductivity,and geometric frustration.The recently discovered Kagome superconductors AV3Sb5(A = K,Rb,Cs)have attracted widespread attention in the field of condensed matter physics,and many efforts have been made to elucidate their novel physical properties,such as charge density wave,unconventional superconductivity,and band topology.Meanwhile,many groups have effectively tuned these novel properties through chemical doping,offering a good opportunity for further understanding the materials of this system.In this paper,we comprehensively review the latest research progress of the doping effect of this rapidly developed AV3Sb5 system,with the objective of further promoting the in-depth research into Kagome superconductor.Specifically,we review the chemical doping in CsV3Sb5 with elements such as Nb,Ta,Ti,and Sn,and the surface doping with elements Cs or O as well,and describe their influences on the novel quantum properties,especially superconductivity,charge density wave,and electronic band structure of the material.Furthermore,the intricate physical mechanism of doping manipulation is discussed,in order to provide a basic knowledge for further understanding and studying the rich quantum effects of the system,such as charge density waves,time reversal symmetry breaking,and superconductivity.
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