Phase breaking in ballistic quantum dots

Transition from two- to zero-dimensional behavior

J. P. Bird, K. Ishibashi, D. K. Ferry, Y. Ochiai, Y. Aoyagi, T. Sugano

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

We determine the phase-breaking time τφ of electrons in ballistic quantum dots, from the aperiodic fluctuations observed in their low-temperature magnetoconductance. Our analysis shows that at temperatures close to a degree Kelvin τφ scales roughly inversely with temperature, reminiscent of electron-electron scattering in two-dimensional disordered systems. At much lower temperatures, however, a saturation in τφ is observed, with the transition between the two regimes occurring once the thermal smearing becomes smaller than the expected level spacing in the dot. We therefore suggest that the saturation results from a transition from two- to zero-dimensional transport, as the discrete level structure of the dot becomes resolved.

Original languageEnglish (US)
Pages (from-to)18037-18040
Number of pages4
JournalPhysical Review B
Volume51
Issue number24
DOIs
StatePublished - 1995

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

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Bird, J. P., Ishibashi, K., Ferry, D. K., Ochiai, Y., Aoyagi, Y., & Sugano, T. (1995). Phase breaking in ballistic quantum dots: Transition from two- to zero-dimensional behavior. Physical Review B, 51(24), 18037-18040. https://doi.org/10.1103/PhysRevB.51.18037

Phase breaking in ballistic quantum dots : Transition from two- to zero-dimensional behavior. / Bird, J. P.; Ishibashi, K.; Ferry, D. K.; Ochiai, Y.; Aoyagi, Y.; Sugano, T.

In: Physical Review B, Vol. 51, No. 24, 1995, p. 18037-18040.

Research output: Contribution to journalArticle

Bird, JP, Ishibashi, K, Ferry, DK, Ochiai, Y, Aoyagi, Y & Sugano, T 1995, 'Phase breaking in ballistic quantum dots: Transition from two- to zero-dimensional behavior', Physical Review B, vol. 51, no. 24, pp. 18037-18040. https://doi.org/10.1103/PhysRevB.51.18037
Bird, J. P. ; Ishibashi, K. ; Ferry, D. K. ; Ochiai, Y. ; Aoyagi, Y. ; Sugano, T. / Phase breaking in ballistic quantum dots : Transition from two- to zero-dimensional behavior. In: Physical Review B. 1995 ; Vol. 51, No. 24. pp. 18037-18040.
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