Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 43: Spin-dependent Transport II

HL 43.3: Talk

Tuesday, March 15, 2011, 15:00–15:15, POT 251

Long room-temperature electron spin lifetimes in highly doped cubic GaN — Jörg Rudolph¹, •Jan Heye Buß¹, Thorsten Schupp², Donat As², Klaus Lischka², and Daniel Hägele¹ — ¹AG Spektroskopie der kondensierten Materie, Ruhr-Universität Bochum, Germany — ²Universität Paderborn, Department Physik, Warburger Str. 100, 33095 Paderborn, Germany

The wide-gap semiconductor GaN is a promising material for spin-optoelectronic applications in the blue spectral region. The metastable cubic phase of GaN is especially interesting due to its higher symmetry and therefore weaker spin-orbit coupling as compared to the wurtzite phase. We demonstrate very long electron spin relaxation times in highly n-doped cubic GaN (n_D = 1× 10¹⁹ cm⁻³) exceeding 500 ps up to room-temperature. Time-resolved Kerr-rotation measurements show an almost temperature independent spin relaxation time between 80 and 295 K [1], confirming an early prediction of Dyakonov and Perel for a degenerate electron gas.

[1] J. H. Buß et al., Appl. Phys. Lett. 97, 062101 (2010)