Energy relaxation process in a quantum dot studied by DC current and pulse-excited current measurements

Toshimasa Fujisawa, Yasuhiro Tokura, Yoshiro Hirayama

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Energy relaxation from an excited to a ground state in a quantum dot is studied by DC current and pulse-excited current measurements. We find that all the excited states can be classified as short-lived or long-lived excited states, although they are too short or too long for us to determine the actual lifetime with our method. The relaxation time is short (less than a few ns) if the transition takes place by means of electron-phonon interaction, while it is very long (more than a few μs) if the transition involves a spin-flip. The crossover between long and short relaxation time is studied at a particular level crossing.

Original languageEnglish
Pages (from-to)573-579
Number of pages7
JournalPhysica B: Condensed Matter
Volume298
Issue number1-4
DOIs
Publication statusPublished - 2001 Apr 1
Externally publishedYes

Keywords

  • Coulomb blockade
  • Energy relaxation
  • Quantum dot
  • Spin

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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