Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 13: Poster 1
HL 13.62: Poster
Montag, 26. März 2007, 15:00–17:30, Poster A
Spin relaxation in narrow wires of a two-dimensional electron gas — Peter Schwab1, Michael Dzierzawa1, •Cosimo Gorini1, and Roberto Raimondi2 — 1Universität Augsburg, Augsburg, Germany — 2Universita’ degli Studi Roma Tre, Rome, Italy
How does an initially homogeneous spin-polarization in a confined two-dimensional electron gas with Rashba spin-orbit coupling evolve in time? How does the relaxation time depend on system size? Motivated by a recent experiment [1], we study these questions for systems of a size much larger than the Fermi wavelength but comparable and even shorter than the spin-relaxation length [2]. We approach the problem relying on the quasiclassical Green’s function method [3]. The confinement causes the appearance of boundary modes, whose influence on the overall spin relaxation becomes crucial when decreasing the wire width below the spin relaxation length. Depending on the boundary conditions spin relaxation may become faster or slower than in a bulk system.
[1] A. W. Holleitner, V. Sih, R. C. Myers, A. C. Gossard and D. Awschalom, Phys. Rev. Lett. 97, 036805 (2006).
[2] P. Schwab, M. Dzierzawa, C. Gorini and R. Raimondi, Phys. Rev. B 74, 155316 (2006).
[3] P. Schwab and R. Raimondi, Ann. Phys. (Leipzig) 12, 471 (2003).