title: Zero-bias anomalies in narrow tunnel junctions in the quantum Hall regime.
abstract: We report on the study of cleaved-edge-overgrown line junctions with a serendipitously created narrow opening in an otherwise thin, precise line barrier. Two sets of zero-bias anomalies are observed with an enhanced conductance for filling factors ν>1 and a strongly suppressed conductance for ν<1. A transition between the two behaviors is found near ν≈1. The zero-bias anomaly (ZBA) line shapes find explanation in Luttinger liquid models of tunneling between quantum Hall edge states. The ZBA for ν<1 occurs from strong backscattering induced by suppression of quasiparticle tunneling between the edge channels for the n=0 Landau levels. The ZBA for ν>1 arises from weak tunneling of quasiparticles between the n=1 edge channels.
authors.affiliation: James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: P
authors.initials: P
authors.lastname: Jiang
authors.forename: C-C
authors.initials: CC
authors.lastname: Chien
authors.forename: I
authors.initials: I
authors.lastname: Yang
authors.forename: W
authors.initials: W
authors.lastname: Kang
authors.forename: K W
authors.initials: KW
authors.lastname: Baldwin
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West