title: Quantum-classical crossover and apparent metal-insulator transition in a weakly interacting 2D Fermi liquid.
abstract: We report the observation of an apparent parallel magnetic-field-induced metal-insulator transition in a high-mobility two-dimensional electron gas for which spin and localization physics most likely play no major role. The high-mobility metallic phase at low field is consistent with the established Fermi liquid transport theory including phonon scattering, whereas the phase at higher field shows a large insulatinglike negative temperature dependence at resistances much smaller than the quantum of resistance h/e(2). We argue that this observation is a direct manifestation of a quantum-classical crossover arising predominantly from the magneto-orbital coupling between the finite width of the two-dimensional electron gas and the in-plane magnetic field.
authors.affiliation: Department of Physics, McGill University, Montreal, H3A 2T8, Canada.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Zhou
authors.forename: B
authors.initials: B
authors.lastname: Schmidt
authors.forename: C
authors.initials: C
authors.lastname: Proust
authors.forename: G
authors.initials: G
authors.lastname: Gervais
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West
authors.forename: S Das
authors.initials: SD
authors.lastname: Sarma