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Abbreviated Journal Title

Phys. Rev. B

Keywords

Strong Magnetic-Field; Laughlin Droplet; Wave-Functions; States; Excitations; Regime; Channels; Liquid; Disk; Dots; Physics; Condensed Matter

Abstract

When the bulk filling factor is nu=1-1/m with m odd, at. least one counterpropagating chiral collective mode occurs simultaneously with magnetoplasmons at the edge of Fractional quantum Hall samples. Initial experimental searches for an additional mode were unsuccessful. In this paper, we address conditions under which its observation should be expected in experiments where the electronic system is excited and probed by capacitive coupling. We derive realistic expressions for the velocity of the slow counterpropagating mode, starting from a microscopic calculation which is simplified by a Landau-Silin-like separation between long-range Hartree and residual interactions. The microscopic calculation determines the stiffness of the edge to long-wavelength neutral excitations, which fixes the slow-mode velocity, and the effective width of the edge region, which influences the magnetoplasmon dispersion.

Journal Title

Physical Review B

Volume

58

Issue/Number

20

Publication Date

1-1-1998

Document Type

Article

Language

English

First Page

13778

Last Page

13792

WOS Identifier

WOS:000077279800075

ISSN

1098-0121

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