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.
|Number of pages||4|
|Journal||Physica Status Solidi (C) Current Topics in Solid State Physics|
|Publication status||Published - 01-12-2006|
|Event||4th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors, PASPS-IV - Sendai, Japan|
Duration: 15-08-2006 → 18-08-2006
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics