Emergence of charge density wave and Ising superconductivity in centrosymmetric monolayer 1T-HfTe_(2)  

作　　者：Dawei Wang Jizheng Wu Chen Si 

机构地区：[1]Department of Medical Engineering,Medical Supplies Center of PLA General Hospital,Beijing 100853,China [2]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《Nano Research》2023年第8期11521-11527,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12274013 and 11874079);the open research fund program of the State key laboratory of low dimensional quantum physics(No.KF202103);the Independent Research Project of Medical Engineering Laboratory of Chinese PLA General Hospital(No.2022SYSZZKY10).

摘　　要：Understanding and control of many-body collective phenomena such as charge density wave(CDW)and superconductivity in atomically thin crystals remains a hot topic in material science.Here,using first-principles calculations,we find that 1T-HfTe_(2)possessing no CDWs in the bulk form,unexpectedly shows a stable 2×2 CDW order in the monolayer form,which can be attributed to the enhancement of electron–phonon coupling(EPC)in the monolayer.Meanwhile,the CDW induces a metal-to-insulator transition in monolayer 1T-HfTe_(2)through the accompanying lattice distortion.Remarkably,Ising superconductivity with a significantly enhanced in-plane critical field can emerge in centrosymmetric monolayer 1T-HfTe_(2)after the CDW is suppressed by electron doping.The Ising paring is revealed to be protected by the spin–orbital locking without the participation of the inversion symmetry breaking which is a must for conventional 2H-NbSe2-like Ising superconductors.Our results open a new window for designing and controlling novel quantum states in two-dimensional(2D)matter.

关 键 词：charge density wave(CDW) Ising superconductivity two-dimensional(2D)materials HfTe_(2) first-principles calculations 

分 类 号：O41[理学—理论物理]