Local far-infrared spectroscopy of edge states in the quantum Hall regime

A. Lorke; J. P. Kotthaus; J. H. English; A. C. Gossard

doi:10.1103/PhysRevB.53.1054

Local far-infrared spectroscopy of edge states in the quantum Hall regime

A. Lorke, J. P. Kotthaus, J. H. English, and A. C. Gossard

Phys. Rev. B 53, 1054 – Published 15 January 1996

Abstract

Using local spectroscopy, we study the far-infrared response of edge channels in the quantum Hall regime. Both nonresonant and resonant excitations are observed. The resonant signal is shifted with respect to the cyclotron resonance in the two-dimensional electron gas, which reflects the local curvature of the edge potential. The observation of higher-order transitions, which are forbidden in the bulk, reveals the presence of nonparabolic contributions to the edge potential. © 1996 The American Physical Society.

Received 26 September 1995

DOI:https://doi.org/10.1103/PhysRevB.53.1054

Authors & Affiliations

A. Lorke and J. P. Kotthaus

Sektion Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany

J. H. English and A. C. Gossard

Materials Department and Center for Quantized Electronic Structures, University of California, Santa Barbara, California 93106

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Vol. 53, Iss. 3 — 15 January 1996

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