title: Quantum Conductance Probing of Oxygen Vacancies in SrTiO3Epitaxial Thin Film using Graphene.
abstract: Quantum Hall conductance in monolayer graphene on an epitaxial SrTiO3(STO) thin film is studied to understand the role of oxygen vacancies in determining the dielectric properties of STO. As the gate-voltage sweep range is gradually increased in the device, systematic generation and annihilation of oxygen vacancies, evidenced from the hysteretic conductance behavior in the graphene, are observed. Furthermore, based on the experimentally observed linear scaling relation between the effective capacitance and the voltage sweep range, a simple model is constructed to manifest the relationship among the dielectric properties of STO with oxygen vacancies. The inherent quantum Hall conductance in graphene can be considered as a sensitive, robust, and noninvasive probe for understanding the electronic and ionic phenomena in complex transition-metal oxides without impairing the oxide layer underneath.
authors.affiliation: Department of Physics, Sungkyunkwan University, Suwon, 16419, Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon, 16419, Korea.
authors.forename: Kyeong Tae
authors.initials: KT
authors.lastname: Kang
authors.affiliation: Department of Energy Sciences, Sungkyunkwan University, Suwon, 16419, Korea.
authors.forename: Haeyong
authors.initials: H
authors.lastname: Kang
authors.affiliation: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon, 16419, Korea.|Department of Energy Sciences, Sungkyunkwan University, Suwon, 16419, Korea.
authors.forename: Jeongmin
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Energy Sciences, Sungkyunkwan University, Suwon, 16419, Korea.
authors.forename: Dongseok
authors.initials: D
authors.lastname: Suh
authors.affiliation: Department of Physics, Sungkyunkwan University, Suwon, 16419, Korea.
authors.forename: Woo Seok
authors.initials: WS
authors.lastname: Choi
keywords: SrTiO3; epitaxial thin films; graphene; oxygen vacancies; quantum Hall conductance