title: 2D-1D coupling in cleaved edge overgrowth
abstract: We study the scattering properties of an interface between a one-dimensional (1D) wire and a two-dimensional (2D) electron gas. Experiments were conducted in the highly controlled geometry provided by molecular bean epitaxy overgrowth onto the cleaved edge of a high quality GaAs /AlGaAs quantum well. Such structures allow for the creation of variable length 1D-2D coupling sections. We find ballistic 1D electron transport through these interaction regions with a mean free path as long as 6 &mgr;m. Our results explain the origin of the puzzling nonuniversal conductance quantization observed previously in such 1D wires.
authors.affiliation: Bell-Labs, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
authors.lastname: de Picciotto R
authors.initials: HL
authors.lastname: Stormer
authors.initials: A
authors.lastname: Yacoby
authors.initials: LN
authors.lastname: Pfeiffer
authors.initials: KW
authors.lastname: Baldwin
authors.initials: KW
authors.lastname: West