Applied Physics Letters, 2 October 2006
Appl. Phys. Lett. 89, 142104 (2006) (3 pages)
©2006 American Institute of Physics. All rights reserved. 
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Room temperature electron spin coherence in telecom-wavelength quaternary quantum wells
W. H. Lau, V. Sih, N. P. Stern, R. C. Myers, D. A. Buell, A. C. Gossard, and D. D. Awschalom(a)
Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106
(Received: 25 July 2006; accepted: 16 August 2006; published online: 3 October 2006)Time-resolved Kerr rotation spectroscopy is used to monitor the room temperature electron spin dynamics of optical telecommunication wavelength AlInGaAs multiple quantum wells lattice matched to InP. The authors found that electron spin coherence times and effective g factors vary as a function of aluminum concentration. The measured electron spin coherence times of these multiple quantum wells, with wavelengths ranging from 1.26 to 1.53 µm, reach approximately 100 ps at room temperature, and the measured electron effective g factors are in the range from –2.3 to –1.1. ©2006 American Institute of Physics
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