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

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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Bird, J. P., Ishibashi, K., Ferry, D. K., Newbury, R., Olatana, D. M., Ochiai, Y., Aoyagi, Y., & Sugano, T. (1996). Phase breaking in ballistic quantum dots: A correlation field analysis. Surface Science, 361-362, 730-734. https://doi.org/10.1016/0039-6028(96)00521-3

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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.",

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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.

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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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