title: High-mobility two-dimensional electron gas in SrGeO3- and BaSnO3-based perovskite oxide heterostructures: an ab initio study.
abstract: We explored the possibility of producing a high-mobility two-dimensional electron gas (2DEG) in the LaAlO3/SrGeO3and LaGaO3/BaSnO3heterostructures using first-principles electronic structure calculations. Our results show that the 2DEG occurs at n-type LaAlO3/SrGeO3and LaGaO3/BaSnO3interfaces. Compared to the prototype LaAlO3/SrTiO3, LaAlO3/SrGeO3and LaGaO3/BaSnO3systems yield comparable total interfacial charge carrier density but much lower electron effective mass (nearly half the value of LaAlO3/SrTiO3), thus resulting in about twice larger electron mobility and enhanced interfacial conductivity. This work demonstrates that SrGeO3and BaSnO3can be potential substrate materials to achieve a high-mobility 2DEG in the perovskite-oxide heterostructures.
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China and Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093-0448, USA. kesong@ucsd.edu.
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China.
authors.forename: Wu
authors.initials: W
authors.lastname: Tang
authors.affiliation: Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093-0448, USA. kesong@ucsd.edu.
authors.forename: Jianli
authors.initials: J
authors.lastname: Cheng
authors.affiliation: Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093-0448, USA. kesong@ucsd.edu.
authors.forename: Safdar
authors.initials: S
authors.lastname: Nazir
authors.affiliation: Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093-0448, USA. kesong@ucsd.edu.
authors.forename: Kesong
authors.identifier: http://orcid.org/0000-0002-9691-0636
authors.initials: K
authors.lastname: Yang