Rights statement: © 2008 The American Physical Society
Final published version, 160 KB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Article number | 125307 |
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<mark>Journal publication date</mark> | 6/03/2008 |
<mark>Journal</mark> | Physical review B |
Issue number | 12 |
Volume | 77 |
Number of pages | 5 |
Publication Status | Published |
<mark>Original language</mark> | English |
Nuclear polarization dynamics are measured in the nuclear spin bistability regime in a single optically pumped InGaAs/GaAs quantum dot. The controlling role of nuclear spin diffusion from the dot into the surrounding material is revealed in pump-probe measurements of the nonlinear nuclear spin dynamics. We measure nuclear spin polarization decay times in the range of 0.2-5 s, strongly dependent on the optical pumping time. The long nuclear spin decay arises from polarization of the material surrounding the dot by spin diffusion for long (>5s) pumping times. The time-resolved methods allow the detection of the unstable nuclear polarization state in the bistability regime otherwise undetectable in cw experiments.