title: Enhancement Mechanism of the Electron g Factor in Quantum Point Contacts.
abstract: The electron g factor measured in a quantum point contact by source-drain bias spectroscopy is significantly larger than its value in a two-dimensional electron gas. This enhancement, established experimentally in numerous studies, is an outstanding puzzle. In the present work we explain the mechanism of this enhancement in a theory accounting for the electron-electron interactions. We show that the effect relies crucially on the nonequilibrium nature of the spectroscopy at finite bias.
authors.affiliation: School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia and Institute of Theoretical Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: Grégoire
authors.initials: G
authors.lastname: Vionnet
authors.affiliation: School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia.
authors.forename: Oleg P
authors.initials: OP
authors.lastname: Sushkov