Electric field and charge doping induced superconducting transition in 2D freestanding perovskite barium bismuthate  

作　　者：Yaning Cui Tianhao Su Lei Qiao Zongquan Gu Gianni Profeta Alessandra Continenza Wei Ren 

机构地区：[1]Physics Department,Materials Genome Institute,International Center for Quantum and Molecular Structures,Shanghai University,Shanghai 200444,China [2]Shanghai Key Laboratory of High Temperature Superconductors,Shanghai University,Shanghai 200444,China [3]Zhejiang Laboratory,Hangzhou 311100,China [4]School of Microelectronics,Fudan University,Shanghai 200433,China [5]Department of Physical and Chemical Sciences,Universitàdegli Studi dell'Aquila,Coppito(L'Aquila)67100,Italy [6]Consiglio Nazionale delle Ricerche CNR-SPIN,Coppito(L'Aquila)67100,Italy

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第7期102-111,共10页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12074241,11929401,52120204,and 62004043);the Science and Technology Commission of Shanghai Municipality(Grant Nos.22XD1400900,20501130600,21JC1402700,21JC1402600,and 20QA1401000);the Key Research Project of Zhejiang Laboratory(Grant No.2021PE0AC02);the High-Performance Computing Center,Shanghai Technical Service Center of Science and Engineering Computing,Shanghai University。

摘　　要：We present an ab-initio study of monolayer BaBiO_(3) focused on how to harness the insulator-metal transition through suppression of the charge density wave(CDW)phase in this material.After the determination of the most stable structure for the freestanding monolayer,we investigate the effects of an applied electric field and of charge doping on the electronic properties of the system.Our results show that external electric fields of the order of 0.1-0.3 V/A are able to stabilize the metallic phase,destroy the CDW phase and,in addition,lead to a metallic metastable phase.On this same footing,we show that hole doping could also suppress the CDW phase and drive the system toward a metallic phase with large electron-phonon coupling.To this end,we also study the dependence of the electron-phonon coupling on hole-doping concentration and show that this could drive the onset of superconductivity.Indeed,low-dimensional BaBiO3 is an extremely flexible material with electronic properties that could be tuned using different and possibly combined external tools such as electric fields and charge doping,paving the way to achieve effective control on the transition from the CDW,to the metallic and then superconducting phase.

关 键 词：charge wave density phase transition SUPERCONDUCTIVITY 2D material 

分 类 号：TQ132.35[化学工程—无机化工]