Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 63: II-VI-Compounds

HL 63.3: Talk

Wednesday, March 16, 2011, 16:15–16:30, POT 151

Long-lived electron spincoherence in ZnSe-based quantum wells — •Alexander Schwan¹, Evgeny A. Zhukov², Dmitri R. Yakovlev¹, and Manfred Bayer¹ — ¹Experimentelle Physik 2, TU Dortmund, 44221 Dortmund — ²Faculty of Physics, M. V. Lomonosov Moscow State University, 119992 Moscow, Russia

Carrier spin coherence in low-dimensional structures is in focus of current interest due to spintronics applications. We have studied carrier spin coherence in ZnSe/(Zn,Be,Mg)Se quantum wells (QWs) characterized by a type-I band alignment and binary QW material. The spin dephasing time T₂^* of the electron spin coherence is experimentally determined by time-resolved Kerr rotation (TRKR) and resonant spin amplification (RSA) measurements in magnetic fields up to 4 Tesla. The Larmor precession of the electron spins in the ZnSe layers is clearly observed in both the TRKR and RSA signals. Times T₂^* up to 30 ns have been evaluated for localized resident electrons of a temperature of 2 K. The temperature dependence of the electron spin coherence is investigated up to 150 K. For higher temperatures exceeding 20 K, where the electrons are delocalized, the dominant spin dephasing mechanism is the D‘yakonov-Perel mechanism.