Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 85: Poster Session II
HL 85.47: Poster
Donnerstag, 17. März 2011, 18:00–21:00, P4
Room-temperature nanosecond spin-lifetimes in bulk cubic GaN — Jan Heye Buß1, Jörg Rudolph1, •Jeanette Gorewoda1, Thorsten Schupp2, Donat As2, and Daniel Hägele1 — 1AG Spektroskopie der kondensierten Materie, Ruhr-Universität Bochum, Germany — 2Universität Paderborn, Department Physik, Warburger Str. 100, 33095 Paderborn, Germany
The metastable zincblende phase of GaN is a highly interesting material system for semiconductor spintronics due to its small spin-orbit coupling. Systematic investigations of the electron spin dynamics are, however, missing so far. We present time-resolved Kerr-rotation measurements of the temperature and magnetic field dependence of electron spin relaxation in moderately n-doped cubic GaN samples and compare the results with the electron spin dynamics in wurtzite GaN. The higher cubic symmetry of the zincblende phase is shown to lead to significantly slower spin relaxation than in the wurtzite phase with hexagonal symmetry. The room-temperature spin-lifetimes of > 2 ns exceed all values reported for III-V bulk materials so far.