Issue |
EPL
Volume 98, Number 1, April 2012
|
|
---|---|---|
Article Number | 17007 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/98/17007 | |
Published online | 10 April 2012 |
Measurements of a fast nuclear-spin dynamics in a single InAs quantum dot with positively charged exciton
SKLSM, Institute of Semiconductors, CAS - P.O. Box 912, Beijing 100083, China
Received:
5
January
2012
Accepted:
7
March
2012
By using time-resolved spectroscopy with an alternative σ+/σ− laser pulse modulation technique, we are able to measure the fast buildup and decay times of the dynamical nuclear-spin polarization at 5 K for a single InAs quantum dot with positively charged exciton. It is shown that the measured buildup and decay times are 0.27 and 0.5 ms, respectively, in the absence of external magnetic field. By applying an external field of 8 mT in parallel to the sample growth direction, the decay time extends to about 5 ms which is induced by optically pumped electron via the hyperfine interaction between the nuclei and the electron. In addition, it is found that the buildup time is independent of the small external field.
PACS: 78.67.Hc – Quantum dots / 71.35.Pq – Charged excitons (trions) / 71.70.Jp – Nuclear states and interactions
© EPLA, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.