TY - JOUR

T1 - Quantized acoustoelectric current in a finite-length ballistic quantum channel

T2 - The noise spectrum

AU - Galperin, Y. M.

AU - Entin-Wohlman, O.

AU - Levinson, Y.

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0034907666&partnerID=8YFLogxK

U2 - 10.1103/physrevb.63.153309

DO - 10.1103/physrevb.63.153309

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AN - SCOPUS:0034907666

SN - 0163-1829

VL - 63

SP - 1533091

EP - 1533094

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 15

M1 - 153309

ER -