Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 38: Invited Talk Korn
HL 38.1: Hauptvortrag
Donnerstag, 28. Februar 2008, 10:15–11:00, ER 270
Spin dynamics in high-mobility 2D electron systems: effects of electron-electron interaction and anisotropy — •Tobias Korn1, Dominik Stich1, Natalie Steffek1, Dieter Schuh1, Werner Wegscheider1, Ming-Wei Wu2, and Christian Schüller1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg — 2University of Science and Technology of China, Hefei
Understanding the spin dynamics in semiconductor heterostructures is highly important for future semiconductor spintronic devices. In high-mobility 2D electron systems (2DES), the spin lifetime strongly depends on the initial degree of spin polarization due to the electron-electron interaction. By time-resolved Faraday rotation (TRFR) techniques, we demonstrate that the spin lifetime is increased by an order of magnitude as the initial spin polarization degree is raised from the
low-polarization limit to several percent[1,2]. Additionally, the spin lifetime in 2DES is strongly anisotropic if the Rashba and Dresselhaus spin-orbit fields are of the same order of magnitude. By comparing TRFR measurements in an in-plane magnetic field to numerical simulations, we are able to determine both, the Rashba and
the Dresselhaus terms with high accuracy. Using these values, we can infer an in-plane anisotropy of the spin lifetime of about 60 to 1, with a maximum in-plane spin lifetime of several nanoseconds [3].
Stich et al., Phys. Rev. Lett. 98, 176401 (2007).
Stich et al., Phys. Rev. B 76, 205301 (2007).
Stich et al., Phys. Rev. B 76, 073309 (2007).