Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.16: Poster

Freitag, 4. März 2005, 16:30–19:00, Poster TU E

Spin-orbit induced spin-polarized conductances in Y-shaped devices — •Kai Dittmer, Jun-Ichiro Ohe, and Bernhard Kramer — I.Institut für Theoretische Physik, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg, Germany

One of the most important open questions in spintronics is the effective injection of spins into certain devices, e.g. the spin-transistor of Datta and Das [1]. The most simple appearing way is the injection via a ferromagnetic contact. One of the major obstacles in this approach is the current mismatch at the interfaces between the metallic contact and the semiconducting device. Using semiconducting ferromagnets is one way to circumvent this problem, but another problem with ferromagnets is the direct control of the ferromagnetic domains at the interface regions, and a third problem might be the influence of the magnetic stray fields penetrating the device.

As is well known in mesoscopics, spin-orbit interaction together with uncontrolled(impurity-) scattering results in the spin-dephasing of Dyakonov and Perel. Now, can spin-orbit interaction be used to produce spin-polarized currents, just like an inverse Dyakonov-Perel effect? The answer is yes [2], and we would like to propose with the Y-shaped spin-filter a possible device.

• [1] S. Datta and B. Dat, Appl. Phys. Lett. 56, 665 (1990)
• [2] A. A. Kiselev and K. W. Kim, J. Appl. Phys 94, 4001 (2003)