title: Interaction effects and pseudogap in two-dimensional lateral tunnel junctions.
abstract: Tunneling characteristics of a two-dimensional lateral tunnel junction are reported. A pseudogap on the order of Coulomb energy is detected in the tunneling density of states (TDOS) when two identical two-dimensional electron systems are laterally separated by a thin energy barrier. The Coulombic pseudogap remains robust well into the quantum Hall regime until it is overshadowed by the cyclotron gap in the TDOS. The pseudogap is modified by the in-plane magnetic field, demonstrating a nontrivial effect of the in-plane magnetic field on the electron-electron interaction.
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: I
authors.initials: I
authors.lastname: Yang
authors.forename: W
authors.initials: W
authors.lastname: Kang
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: Baldwin
authors.forename: K W
authors.initials: KW
authors.lastname: West