Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.36: Poster

Donnerstag, 26. März 2009, 15:00–17:30, P2

Spin dynamics in symmetric high-mobility GaAs/AlGaAs quantum wells, grown in (110) direction — •Michael Griesbeck, Sebastian Fehringer, Tobias Korn, Dieter Schuh, Werner Wegscheider, and Christian Schüller — Universität Regensburg, Germany

In semiconductor spintronics research, there is growing interest on (110)-grown GaAs/AlGaAs quantum wells because of the long spin lifetime in such systems, which results from the geometry of the Dresselhaus spin-orbit coupling. If the Rashba spin-orbit interaction is suppressed by symmetrical growth and doping of the quantum well, the spin lifetime is no longer limited by the D`yakonov-Perel mechanism and very long spin lifetimes can be observed. We investigate the spin dynamics in symmetric high-mobility (110)-grown GaAs/AlGaAs quantum wells using ultrafast time-resolved Faraday rotation (TRFR) and time-resolved photoluminescence (TRPL). In measurements at low temperatures and high magnetic fields we study the dependence of the spin lifetime on the strength of the applied external magnetic field.