Dresden 2006 – scientific programme

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HL: Halbleiterphysik

HL 13: Spin controlled transport I

HL 13.5: Talk

Tuesday, March 28, 2006, 12:00–12:15, BEY 118

Suppression of Spin Relaxation in n-InGaAs-Wires — •Alexander Holleitner — Center for NanoScience (CeNS), Munich, Germany

The spin dynamics of electrons have been investigated in narrow two-dimensional n-InGaAs channels as a function of the wire width [1]. We find that electron-spin relaxation times increase with decreasing channel width, in accordance with recent theoretical predictions [2]. Surprisingly, the suppression of the spin relaxation rate can be detected for widths that are an order of magnitude larger than the electron mean free path. We find the spin diffusion length and the wire width to be the relevant length scales for explaining these effects. We discuss to which extent confinement, spin-orbit coupling, and structural parameters such as strain explain the observed effects. For the presented work, we acknowledge financial support by AFOSR and ONR. [1] A.W. Holleitner, V. Sih, R.C. Myers, A.C. Gossard, and D.D. Awschalom in preparation (2005). [2] A.G. Malshukov, K.A. Chao, Phys. Rev. B 61, 2413 (2000).