Superconducting,Topological,and Transport Properties of Kagome Metals CsTi_(3)Bi_(5)and RbTi_(3)Bi_(5)
作者机构：School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Department of PhysicsFaculty of ScienceNational University of Singapore117551Singapore Kavli Institute for Theoretical Sciencesand CAS Center for Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100190China
出 版 物：《Research》 (研究（英文）)
年 卷 期：2024年第2023卷第2期
页 面：753-762页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported in part by the National Key R&D Program of China(Grant No.2018YFA0305800) the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB28000000) the National Natural Science Foundation of China(Grant No.11834014) the Innovation Program for Quantum Science and Technology(No.2021ZD0301800) B.G.is supported in part by the National Natural Science Foundation of China(Grant No.12074378) the Chinese Academy of Sciences(Grant No.YSBR-030 and No.Y929013EA2) the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB33000000) the Beijing Natural Science Foundation(Grant No.Z190011)
主 题：doping superconductivity conductivity
摘 要：The recently discovered ATi_(3)Bi_(5)(A=Cs,Rb)exhibit intriguing quantum phenomena including superconductivity,electronic nematicity,and abundant topological ***_(3)Bi_(5)present promising platforms for studying kagome superconductivity,band topology,and charge orders in parallel with *** this work,we comprehensively analyze various properties of ATi_(3)Bi_(5)covering superconductivity under pressure and doping,band topology under pressure,thermal conductivity,heat capacity,electrical resistance,and spin Hall conductivity(SHC)using first-principles *** superconducting transition temperature(Tc)of CsTi_(3)Bi_(5)and RbTi_(3)Bi_(5)at ambient pressure are about 1.85 and 1.92 *** subject to pressure,Tc of CsTi_(3)Bi_(5)exhibits a special valley and dome shape,which arises from quasi-two-dimensional compression to three-dimensional isotropic compression within the context of an overall decreasing ***,Tc of RbTi_(3)Bi_(5)can be effectively enhanced up to 3.09 K by tuning the kagome van Hove singularities(VHSs)and flat band through *** can also induce abundant topological surface states at the Fermi energy(EF)and tune VHSs across ***,our transport calculations are in excellent agreement with recent experiments,confirming the absence of charge density ***,SHC of CsTi_(3)Bi_(5)can reach up to 226h·(e·Ω·cm)^(-1)at *** work provides a timely and detailed analysis of the rich physical properties for ATi_(3)Bi_(5),offering valuable insights for further experimental verifications and investigations in this field.
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