title: Metal-insulator oscillations in a two-dimensional electron-hole system
abstract: The electrical transport properties of a bipolar InAs/GaSb system have been studied in a magnetic field. The resistivity oscillates between insulating and metallic behavior while the quantum Hall effect shows a digital character oscillating from 0 to 1 conductance quantum e(2)/h. The insulating behavior is attributed to the formation of a total energy gap in the system. A novel looped edge state picture is proposed associated with the appearance of a voltage between Hall probes which is symmetric on magnetic field reversal.
authors.affiliation: Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.initials: RJ
authors.lastname: Nicholas
authors.initials: K
authors.lastname: Takashina
authors.initials: M
authors.lastname: Lakrimi
authors.initials: B
authors.lastname: Kardynal
authors.initials: S
authors.lastname: Khym
authors.initials: NJ
authors.lastname: Mason
authors.initials: DM
authors.lastname: Symons
authors.initials: DK
authors.lastname: Maude
authors.initials: JC
authors.lastname: Portal