Quantized acoustoelectric current in a finite-length ballistic quantum channel: The noise spectrum

Y. M. Galperin, O. Entin-Wohlman, Y. Levinson

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Fluctuations in the acoustoelectric current, induced by a surface acoustic wave propagating along a ballistic quantum channel, are considered. We focus on the large-wave-amplitude case, in which it has been experimentally found that the current is quantized, and analyze the noise spectrum. A phenomenological description of the process, in terms of a random pulse sequence, is proposed. The important ingredients of this description are the probabilities pn for a surface acoustic wave well to capture n electrons. It is found that from the noise characteristics one can obtain these probabilities, and also estimate the typical length scales of the regions in which the electrons are trapped.

Original languageEnglish
Article number153309
Pages (from-to)1533091-1533094
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number15
DOIs
StatePublished - 1 Jan 2001
Externally publishedYes

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