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 journalArticle

18 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)730-734
Number of pages5
JournalSurface Science
Volume361-362
DOIs
StatePublished - Jul 20 1996

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Ballistics
ballistics
Semiconductor quantum dots
quantum dots
Temperature
temperature
electron scattering
electrons
Electron scattering
Electrons
saturation

Keywords

  • Electrical transport
  • Electrical transport measurements
  • Heterojunctions
  • Quantum effects

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Bird, J. P., Ishibashi, K., Ferry, D. K., Newbury, R., Olatana, D. M., Ochiai, 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

Phase breaking in ballistic quantum dots : A correlation field analysis. / Bird, J. P.; Ishibashi, K.; Ferry, D. K.; Newbury, R.; Olatana, D. M.; Ochiai, Y.; Aoyagi, Y.; Sugano, T.

In: Surface Science, Vol. 361-362, 20.07.1996, p. 730-734.

Research output: Contribution to journalArticle

Bird, JP, Ishibashi, K, Ferry, DK, Newbury, R, Olatana, DM, Ochiai, Y, Aoyagi, Y & Sugano, T 1996, 'Phase breaking in ballistic quantum dots: A correlation field analysis', Surface Science, vol. 361-362, pp. 730-734. https://doi.org/10.1016/0039-6028(96)00521-3
Bird JP, Ishibashi K, Ferry DK, Newbury R, Olatana DM, Ochiai Y et al. Phase breaking in ballistic quantum dots: A correlation field analysis. Surface Science. 1996 Jul 20;361-362:730-734. https://doi.org/10.1016/0039-6028(96)00521-3
Bird, J. P. ; Ishibashi, K. ; Ferry, D. K. ; Newbury, R. ; Olatana, D. M. ; Ochiai, Y. ; Aoyagi, Y. ; Sugano, T. / Phase breaking in ballistic quantum dots : A correlation field analysis. In: Surface Science. 1996 ; Vol. 361-362. pp. 730-734.
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