Electrical pump and probe measurements of a quantum dot in the Coulomb blockade regime

Toshimasa Fujisawa, David Guy Austing, Yoshiro Hirayama, Seigo Tarucha

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We describe two kinds of electrical pump and probe measurements to investigate energy relaxation time in a quantum dot in the Coulomb blockade regime. Transient current driven by single-step pulses can be used to determine the tunneling rates for the two tunneling barriers as well as the relaxation rate under a limited condition. A double-step pulse scheme is more useful for deducing longer relaxation times. The feasibility of these techniques is demonstrated by simple simulations based on rate equations that describe the time-dependent transport, and by experiments performed on a few-electron quantum dot.

Original languageEnglish
Pages (from-to)4804-4808
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number7 B
Publication statusPublished - 2003 Jul
Externally publishedYes


  • Coulomb blockade
  • Energy relaxation
  • Pump and probe measurement
  • Quantum dot

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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