Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot

S. Sasaki, T. Fujisawa, T. Hayashi, Y. Hirayama

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Spin relaxation from a triplet excited state to a singlet ground state in a semiconductor quantum dot is studied by employing an electrical pump-and-probe method. Spin relaxation occurs via cotunneling when the tunneling rate is relatively large, confirmed by a characteristic square dependence of the relaxation rate on the tunneling rate. When cotunneling is suppressed by reducing the tunneling rate, the intrinsic spin relaxation is dominated by spin-orbit interaction. We discuss a selection rule of the spin-orbit interaction based on the observed double-exponential decay of the triplet state.

Original languageEnglish
Article number056803
JournalPhysical review letters
Volume95
Issue number5
DOIs
Publication statusPublished - 2005 Jul 29
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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