Spin filtering and spin relaxation time in a GaAs quantum dot

K. Hitachi, J. Sugawa, M. Yamamoto, S. Tarucha

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


We experimentally studied spin-dependent tunneling and spin relaxation for a quantum dot holding a small number of electrons near the regime of filling factor = 2. We used a quantum point contact as an electrometer to measure a temporal behavior of single electron tunneling through the quantum dot. We observed the tunneling time 11 times faster for a spin triplet state than for a spin singlet state, and used this difference to derive a triplet to singlet relaxation time. The obtained relaxation time ranged from 0.2 to 0.6 msec depending on the relaxation energy. This result compares fairly well to theory of spin-orbit interaction.

Original languageEnglish
Pages (from-to)4342-4345
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number12
Publication statusPublished - 01-12-2006
Externally publishedYes
Event4th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors, PASPS-IV - Sendai, Japan
Duration: 15-08-200618-08-2006

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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