Regensburg 2007 – wissenschaftliches Programm

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SYSS: Symposium Spins in Semiconductors

SYSS 1: Spins in Semiconductors

SYSS 1.1: Hauptvortrag

Montag, 26. März 2007, 09:30–10:00, H1

Generating and manipulating spins in semiconductors — •David Awschalom — Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA 93106 USA

Spin-orbit coupling in semiconductors relates the spin of an electron to its momentum, and provides a pathway for electrically initializing and manipulating electron spins for applications in spintronics and spin-based quantum information processing. We will provide an overview of optical studies exploring spin dynamics in conventional and magnetically-doped III-V semiconductors, followed by recent experiments probing the all-electrical generation and manipulation of spins. Using magneto-optical spectroscopies with temporal and spatial resolution, new phenomena including current-induced spin polarization and the spin Hall effect have been observed in bulk semiconductors and two dimensional heterostructures. These effects have recently been exploited to electrically generate on-chip spin currents that exceed the spin diffusion length and propagate macroscopic distances in the solid state. Surprisingly, these dynamics are observed over a broad range of temperatures and persist to room temperature in II-VI materials despite no evidence for electrically-induced internal magnetic fields and notably weak spin-orbit coupling. The results reveal opportunities for tuning spin sources using quantum confinement, strain and device engineering in magnetic and non-magnetic materials.