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 journalArticlepeer-review

18 Scopus citations


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
StatePublished - Jul 20 1996


  • 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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