| Autor: |
Werner Wegscheider, Dieter Schuh, R. Schulz, Christian Schüller, Tobias Korn, Dominik Stich |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
Physica E: Low-dimensional Systems and Nanostructures. 40:1542-1544 |
| ISSN: |
1386-9477 |
| DOI: |
10.1016/j.physe.2007.09.170 |
| Popis: |
A large anisotropy in the spin dephasing times for the different in-plane directions of [0 0 1] quantum wells has been predicted in calculations by Averkiev and Golub [Phys. Rev. B 60 (1999) 15582] for systems with both Rashba and Dresselhaus spin-orbit fields. Here, we present time-resolved Faraday rotation measurements performed in the Voigt geometry on a high-mobility 2D electron system grown on a [0 0 1] substrate. An out-of-plane spin polarization is created in the sample by a circularly polarized pump pulse. The magnetic field applied in the sample plane forces the spins to precess perpendicular to it. For a magnetic field applied along [1 1 0], the spins precess into the View the MathML source direction, which is in the sample plane, for a magnetic field along View the MathML source, the spins precess into the [1 1 0] direction. The experimentally determined spin dephasing times for these two different cases differ by about 60%, demonstrating that the predicted anisotropy is present in our sample. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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