Dresden 2009 – wissenschaftliches Programm

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SYSC: Symposium Spin Coherence in Solids

SYSC 1: Spin Coherence in Solids

SYSC 1.4: Hauptvortrag

Mittwoch, 25. März 2009, 11:00–11:30, BAR SCHÖ

Spin relaxation in quasi-one-dimensional electron systems: transition from 2D to 1D — •Alexander Holleitner — Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 3, 85748 Garching.

For potential information processing schemes which combine quantum mechanical and classical data, it is of particular interest to manipulate and to control carrier spin dynamics in non-magnetic materials by utilizing the spin-orbit interaction [1]. In three- and two-dimensional (3D and 2D) carrier systems, spin-orbit coupling creates a randomizing momentum-dependent effective magnetic field; the corresponding relaxation process is known as the D*yakonov*Perel (DP) mechanism. In an ideal 1D system, a complete suppression of the DP spin relaxation has been predicted, if the lateral width of a 2D channel is reduced to be on the order of the electron mean free path. For the regime approaching the 1D limit, we recently reported a progressive slowing of the spin relaxation in InGaAs channels, which is in agreement with a dimensionally constrained DP mechanism [2,3]. The dimensional crossover can be understood in terms of an interplay between the channel width, the spin precession length over which the electrons remain spin polarized, and the effect of spin scattering at the boundaries of the channels.

[1] D.D. Awschalom and M. Flatte Nature Phys. 3, 153 (2007).

[2] A.W. Holleitner, V. Sih, R.C. Myers, A.C. Gossard, and D.D. Awschalom, Phys. Rev. Lett. 97, 036805 (2006).

[3] A.W. Holleitner, V. Sih, R.C. Myers, A.C. Gossard,and D.D. Awschalom, New J. of Phys. 9, 342 (2007).