title: Electric and Magnetic Tuning Between the Trivial and Topological Phases in InAs/GaSb Double Quantum Wells.
abstract: Among the theoretically predicted two-dimensional topological insulators, InAs/GaSb double quantum wells (DQWs) have a unique double-layered structure with electron and hole gases separated in two layers, which enables tuning of the band alignment via electric and magnetic fields. However, the rich trivial-topological phase diagram has yet to be experimentally explored. We present an in situ and continuous tuning between the trivial and topological insulating phases in InAs/GaSb DQWs through electrical dual gating. Furthermore, we show that an in-plane magnetic field shifts the electron and hole bands relatively to each other in momentum space, functioning as a powerful tool to discriminate between the topologically distinct states.
authors.affiliation: QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
authors.forename: Fanming
authors.initials: F
authors.lastname: Qu
authors.affiliation: QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
authors.forename: Arjan J A
authors.initials: AJ
authors.lastname: Beukman
authors.affiliation: QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
authors.forename: Stevan
authors.initials: S
authors.lastname: Nadj-Perge
authors.affiliation: QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
authors.forename: Michael
authors.initials: M
authors.lastname: Wimmer
authors.affiliation: HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: Binh-Minh
authors.initials: BM
authors.lastname: Nguyen
authors.affiliation: HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Yi
authors.affiliation: HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: Jacob
authors.initials: J
authors.lastname: Thorp
authors.affiliation: HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: Marko
authors.initials: M
authors.lastname: Sokolich
authors.affiliation: HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, USA.
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Kiselev
authors.affiliation: Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Manfra
authors.affiliation: Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
authors.forename: Charles M
authors.initials: CM
authors.lastname: Marcus
authors.affiliation: QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
authors.forename: Leo P
authors.initials: LP
authors.lastname: Kouwenhoven