Spin filtering and spin relaxation time in a GaAs quantum dot

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

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

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
Volume3
Issue number12
DOIs
Publication statusPublished - 01-12-2006
Event4th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors, PASPS-IV - Sendai, Japan
Duration: 15-08-200618-08-2006

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relaxation time
quantum dots
electrometers
electron tunneling
spin-orbit interactions
atomic energy levels
electrons
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Hitachi, K. ; Sugawa, J. ; Yamamoto, M. ; Tarucha, S. / Spin filtering and spin relaxation time in a GaAs quantum dot. In: Physica Status Solidi (C) Current Topics in Solid State Physics. 2006 ; Vol. 3, No. 12. pp. 4342-4345.
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Spin filtering and spin relaxation time in a GaAs quantum dot. / Hitachi, K.; Sugawa, J.; Yamamoto, M.; Tarucha, S.

In: Physica Status Solidi (C) Current Topics in Solid State Physics, Vol. 3, No. 12, 01.12.2006, p. 4342-4345.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Spin filtering and spin relaxation time in a GaAs quantum dot

AU - Hitachi, K.

AU - Sugawa, J.

AU - Yamamoto, M.

AU - Tarucha, S.

PY - 2006/12/1

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N2 - 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.

AB - 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.

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