title: Zero-bias anomaly and kondo-assisted quasiballistic 2D transport.
abstract: Nonequilibrium transport measurements in mesoscopic quasiballistic 2D electron systems show an enhancement in the differential conductance around the Fermi energy. At very low temperatures, such a zero-bias anomaly splits, leading to a suppression of linear transport at low energies. We also observed a scaling of the nonequilibrium characteristics at low energies which resembles electron scattering by two-state systems, addressed in the framework of two-channel Kondo model. Detailed sample-to-sample reproducibility indicates an intrinsic phenomenon in unconfined 2D systems in the low electron-density regime.
authors.affiliation: Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Ghosh
authors.forename: M H
authors.initials: MH
authors.lastname: Wright
authors.forename: C
authors.initials: C
authors.lastname: Siegert
authors.forename: M
authors.initials: M
authors.lastname: Pepper
authors.forename: I
authors.initials: I
authors.lastname: Farrer
authors.forename: C J B
authors.initials: CJ
authors.lastname: Ford
authors.forename: D A
authors.initials: DA
authors.lastname: Ritchie