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

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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 - Jan 1 1995

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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