Abstract
The electron spin dynamics in (111)-oriented quantum wells is studied by time-resolved photoluminescence spectroscopy. By applying an external electric field of a two-order of magnitude increase of the spin relaxation time can be observed reaching values larger than 30 ns; this is a consequence of the electric field tuning of the spin-orbit conduction band splitting which can almost vanish when the Rashba term compensates exactly the Dresselhaus one. The measurements under a transverse magnetic field demonstrate that the electron spin relaxation time for the three space directions can be tuned simultaneously with the applied electric field.
- Received 27 July 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.136604
© 2011 American Physical Society
Viewpoint
A Well-Rounded Life for an Electron Spin
Published 19 September 2011
Electric-field control of the spin-orbit field in [111] quantum wells lengthens the spin coherence time.
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