Edge magnetoplasmons in single two-dimensional electron disks at microwave frequencies: Determination of the lateral depletion length

24 April 1995

journal article
Published by AIP Publishing in Applied Physics Letters

Vol. 66 (17) , 2271-2273
https://doi.org/10.1063/1.113189

Abstract

We present a new method to determine the lateral depletion length (LDL) at the boundary of a two‐dimensional electron system (2DES). This approach exploits the fact that in high magnetic fields certain plasma excitations of the confined 2DES (edge‐magnetoplasmons, EMPs) are sensitive to details of the density profile near the edge. Comparing the measured magnetic‐field dispersion of EMPs in a circular mesa with existing classical theories, the LDL is found to be between 0.3 and 0.6 μm for an electron density of 3.0×10¹¹ cm⁻².

Keywords

QUANTUM WELLS
ELECTRON GAS
BOUNDARY CONDITIONS
EDGE LOCALIZED MODES
PLASMONS
MAGNETOPLASMA
COLLECTIVE EXCITATIONS
MICROWAVE SPECTRA

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