Electron Spin Dynamics in a Self-Assembled Semiconductor Quantum Dot: The Limit of Low Magnetic Fields
- 3 August 2006
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 97 (5), 056602
- https://doi.org/10.1103/physrevlett.97.056602
Abstract
Using the trion as an optical probe, we uncover novel electron spin dynamics in Stranski-Krastanov quantum dots. The longitudinal spin lifetime obeys an inverse power law associated with recharging processes in the dot ensemble. No hint at spin-orbit mediated spin relaxation is found. At very weak magnetic fields (), electron spin dynamics related to the hyperfine interaction with the lattice nuclei is uncovered. A strong Knight field gives rise to nuclear ordering and formation of dynamical polarization on a time scale under continuous electron spin pumping. The associated spin transients are temperature robust and can be observed up to 100 K.
Keywords
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