Probing of level correlation effects in quantum dots by surface acoustic-waves

A. Knäbchen; O. Entin-Wohlman; Y. B. Levinson

doi:10.1016/S0921-4526(98)00102-1

Probing of level correlation effects in quantum dots by surface acoustic-waves

A. Knäbchen, O. Entin-Wohlman, Y. B. Levinson

Research output: Contribution to journal › Article › peer-review

Abstract

The attenuation, Γ, of surface acoustic waves (SAWs) by an array of isolated quantum dots is studied. The limiting cases of continuous and discrete energy spectra of the dots are discussed. The spectra are continuous when the SAW frequency ω is larger than the mean level spacing Δ or when the levels overlap due to broadening, τ_φ^-1 > ΔΛ τ_φ^-1 being the phase breaking rate. Discrete spectra are obtained for ω, τ_φ^-1 < Δ. The sensitivity of Γ with respect to the global symmetries ("weak localization effects") is much more pronounced in the discrete spectrum limit, since level correlation effects are resolved. The measurement of Γ yields the temperature dependence of both τ_φ^-1 and the equilibration rate τ_e^-1.

Original language	English
Pages (from-to)	220-223
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	249-251
DOIs	https://doi.org/10.1016/S0921-4526(98)00102-1
State	Published - 17 Jun 1998
Externally published	Yes

Keywords

Quantum dots
Random matrix theory
Surface acoustic waves

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4526(98)00102-1

Cite this

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title = "Probing of level correlation effects in quantum dots by surface acoustic-waves",

abstract = "The attenuation, Γ, of surface acoustic waves (SAWs) by an array of isolated quantum dots is studied. The limiting cases of continuous and discrete energy spectra of the dots are discussed. The spectra are continuous when the SAW frequency ω is larger than the mean level spacing Δ or when the levels overlap due to broadening, τφ-1 > ΔΛ τφ-1 being the phase breaking rate. Discrete spectra are obtained for ω, τφ-1 < Δ. The sensitivity of Γ with respect to the global symmetries ({"}weak localization effects{"}) is much more pronounced in the discrete spectrum limit, since level correlation effects are resolved. The measurement of Γ yields the temperature dependence of both τφ-1 and the equilibration rate τe-1.",

keywords = "Quantum dots, Random matrix theory, Surface acoustic waves",

author = "A. Kn{\"a}bchen and O. Entin-Wohlman and Levinson, {Y. B.}",

note = "Funding Information: Financial support by the German-Israeli Foundation, the Israel Academy of Sciences and Humanities, and the Deutsche Forschungsgemeinschaft is gratefully acknowledged. We thank Y. Galperin, A. Tilke, and A. Wixforth for discussions.",

year = "1998",

month = jun,

day = "17",

doi = "10.1016/S0921-4526(98)00102-1",

language = "English",

volume = "249-251",

pages = "220--223",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Probing of level correlation effects in quantum dots by surface acoustic-waves

AU - Knäbchen, A.

AU - Entin-Wohlman, O.

AU - Levinson, Y. B.

N1 - Funding Information: Financial support by the German-Israeli Foundation, the Israel Academy of Sciences and Humanities, and the Deutsche Forschungsgemeinschaft is gratefully acknowledged. We thank Y. Galperin, A. Tilke, and A. Wixforth for discussions.

PY - 1998/6/17

Y1 - 1998/6/17

N2 - The attenuation, Γ, of surface acoustic waves (SAWs) by an array of isolated quantum dots is studied. The limiting cases of continuous and discrete energy spectra of the dots are discussed. The spectra are continuous when the SAW frequency ω is larger than the mean level spacing Δ or when the levels overlap due to broadening, τφ-1 > ΔΛ τφ-1 being the phase breaking rate. Discrete spectra are obtained for ω, τφ-1 < Δ. The sensitivity of Γ with respect to the global symmetries ("weak localization effects") is much more pronounced in the discrete spectrum limit, since level correlation effects are resolved. The measurement of Γ yields the temperature dependence of both τφ-1 and the equilibration rate τe-1.

AB - The attenuation, Γ, of surface acoustic waves (SAWs) by an array of isolated quantum dots is studied. The limiting cases of continuous and discrete energy spectra of the dots are discussed. The spectra are continuous when the SAW frequency ω is larger than the mean level spacing Δ or when the levels overlap due to broadening, τφ-1 > ΔΛ τφ-1 being the phase breaking rate. Discrete spectra are obtained for ω, τφ-1 < Δ. The sensitivity of Γ with respect to the global symmetries ("weak localization effects") is much more pronounced in the discrete spectrum limit, since level correlation effects are resolved. The measurement of Γ yields the temperature dependence of both τφ-1 and the equilibration rate τe-1.

KW - Quantum dots

KW - Random matrix theory

KW - Surface acoustic waves

UR - http://www.scopus.com/inward/record.url?scp=0346364105&partnerID=8YFLogxK

U2 - 10.1016/S0921-4526(98)00102-1

DO - 10.1016/S0921-4526(98)00102-1

M3 - Article

AN - SCOPUS:0346364105

SN - 0921-4526

VL - 249-251

SP - 220

EP - 223

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

ER -

Probing of level correlation effects in quantum dots by surface acoustic-waves

Abstract

Keywords

ASJC Scopus subject areas

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