Phase breaking in ballistic quantum dots: A correlation field analysis

J. P. Bird; K. Ishibashi; D. K. Ferry; R. Newbury; D. M. Olatana; Y. Ochiai; Y. Aoyagi; T. Sugano

doi:10.1016/0039-6028(96)00521-3

Phase breaking in ballistic quantum dots: A correlation field analysis

J. P. Bird, K. Ishibashi, D. K. Ferry, R. Newbury, D. M. Olatana, Y. Ochiai, Y. Aoyagi, T. Sugano

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

18 Scopus citations

Abstract

We use a novel technique to determine the phase breaking time τ_φ of electrons in ballistic quantum dots, from the aperiodic fluctuations observed in their low-temperature magnetoconductance. At temperatures below 100 mK, roughly similar values of τ_φ are obtained in both sizes of dot studied, suggesting a strong materials-related influence on τ_φ. Analysing the temperature-dependent characteristics of the fluctuations, τ_φ is found to scale roughly inversely with temperature close to 1 K, reminiscent of electron-electron scattering in two-dimensional disordered systems. At much lower temperatures, however, a saturation in τ_φ is observed, and is thought to result from a transition from two-to zero-dimensional transport, which occurs as the discrete level structure of the dot becomes resolved.

Original language	English (US)
Pages (from-to)	730-734
Number of pages	5
Journal	Surface Science
Volume	361-362
DOIs	https://doi.org/10.1016/0039-6028(96)00521-3
State	Published - Jul 20 1996

Keywords

Electrical transport
Electrical transport measurements
Heterojunctions
Quantum effects

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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title = "Phase breaking in ballistic quantum dots: A correlation field analysis",

abstract = "We use a novel technique to determine the phase breaking time τφ of electrons in ballistic quantum dots, from the aperiodic fluctuations observed in their low-temperature magnetoconductance. At temperatures below 100 mK, roughly similar values of τφ are obtained in both sizes of dot studied, suggesting a strong materials-related influence on τφ. Analysing the temperature-dependent characteristics of the fluctuations, τφ is found to scale roughly inversely with temperature close to 1 K, reminiscent of electron-electron scattering in two-dimensional disordered systems. At much lower temperatures, however, a saturation in τφ is observed, and is thought to result from a transition from two-to zero-dimensional transport, which occurs as the discrete level structure of the dot becomes resolved.",

keywords = "Electrical transport, Electrical transport measurements, Heterojunctions, Quantum effects",

author = "Bird, {J. P.} and K. Ishibashi and Ferry, {D. K.} and R. Newbury and Olatana, {D. M.} and Y. Ochiai and Y. Aoyagi and T. Sugano",

year = "1996",

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doi = "10.1016/0039-6028(96)00521-3",

language = "English (US)",

volume = "361-362",

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TY - JOUR

T1 - Phase breaking in ballistic quantum dots

T2 - A correlation field analysis

AU - Bird, J. P.

AU - Ishibashi, K.

AU - Ferry, D. K.

AU - Newbury, R.

AU - Olatana, D. M.

AU - Ochiai, Y.

AU - Aoyagi, Y.

AU - Sugano, T.

PY - 1996/7/20

Y1 - 1996/7/20

N2 - We use a novel technique to determine the phase breaking time τφ of electrons in ballistic quantum dots, from the aperiodic fluctuations observed in their low-temperature magnetoconductance. At temperatures below 100 mK, roughly similar values of τφ are obtained in both sizes of dot studied, suggesting a strong materials-related influence on τφ. Analysing the temperature-dependent characteristics of the fluctuations, τφ is found to scale roughly inversely with temperature close to 1 K, reminiscent of electron-electron scattering in two-dimensional disordered systems. At much lower temperatures, however, a saturation in τφ is observed, and is thought to result from a transition from two-to zero-dimensional transport, which occurs as the discrete level structure of the dot becomes resolved.

AB - We use a novel technique to determine the phase breaking time τφ of electrons in ballistic quantum dots, from the aperiodic fluctuations observed in their low-temperature magnetoconductance. At temperatures below 100 mK, roughly similar values of τφ are obtained in both sizes of dot studied, suggesting a strong materials-related influence on τφ. Analysing the temperature-dependent characteristics of the fluctuations, τφ is found to scale roughly inversely with temperature close to 1 K, reminiscent of electron-electron scattering in two-dimensional disordered systems. At much lower temperatures, however, a saturation in τφ is observed, and is thought to result from a transition from two-to zero-dimensional transport, which occurs as the discrete level structure of the dot becomes resolved.

KW - Electrical transport

KW - Electrical transport measurements

KW - Heterojunctions

KW - Quantum effects

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UR - http://www.scopus.com/inward/citedby.url?scp=0030192992&partnerID=8YFLogxK

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VL - 361-362

SP - 730

EP - 734

JO - Surface Science

JF - Surface Science

SN - 0039-6028

ER -

Phase breaking in ballistic quantum dots: A correlation field analysis

Abstract

Keywords

ASJC Scopus subject areas

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