title: Structure of a single sharp quantum Hall edge probed by momentum-resolved tunneling.
abstract: Momentum-resolved magnetotunneling spectroscopy is performed at a single sharp quantum Hall (QH) edge to probe the structure of integer QH edge modes. An epitaxially overgrown cleaved edge is shown to realize the sharp-edge limit with interchannel distances smaller than both the magnetic length and the Bohr radius where the Chklovskii soft-edge picture is no longer valid. The line shape of principal conductance peaks is explained, and an edge filling factor is determined from the peak position. A step in the dispersion is attributed to fluctuations in the QH ground energy.
authors.affiliation: Walter Schottky Institut, Technische Universität München, D-85748 Garching, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Huber
authors.forename: M
authors.initials: M
authors.lastname: Grayson
authors.forename: M
authors.initials: M
authors.lastname: Rother
authors.forename: W
authors.initials: W
authors.lastname: Biberacher
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider
authors.forename: G
authors.initials: G
authors.lastname: Abstreiter