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

中国科学:物理学、力学、天文学英文版 2023年第7期66卷 102-111页

作者： Yaning Cui Tianhao Su Lei Qiao Zongquan Gu gianni profeta Alessandra Continenza Wei Ren Physics Department Materials Genome InstituteInternational Center for Quantum and Molecular StructuresShanghai UniversityShanghai 200444China Shanghai Key Laboratory of High Temperature Superconductors Shanghai UniversityShanghai 200444China Zhejiang Laboratory Hangzhou 311100China School of Microelectronics Fudan UniversityShanghai 200433China Department of Physical and Chemical Sciences Universitàdegli Studi dell'AquilaCoppito(L'Aquila)67100Italy Consiglio Nazionale delle Ricerche CNR-SPIN Coppito(L'Aquila)67100Italy

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 *** 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 *** 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 *** 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 *** 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 ***,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

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