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TT: Fachverband Tiefe Temperaturen

TT 6: TR: Nanoelectronics II: Spintronics and Magnetotransport

TT 6.12: Vortrag

Montag, 22. März 2010, 17:00–17:15, H19

Influence of Different Spin-Orbit Terms on Spin Transport in HgTe Quantum Wells — •Rolf W. Reinthaler1, Dietrich Rothe1, Chao-xing Liu2, Laurens W. Molenkamp2, and Ewelina M. Hankiewicz11Institut für Theoretische Physik und Astrophysik, Würzburg, Germany — 2Physikalisches Institut (EP3), Würzburg, Germany

We derive, within kp theory, an effective four band model (conduction/heavy hole bands) describing physics of HgTe quantum wells with the Dirac-like and Rashba types spin-orbit interactions.

The physics of both contributions is discussed using the Landauer-Büttiker approach and with the semiclassical equations of motions within the wave packet formalism. We find that the spin-Hall conductance originating from the Rashba spin-orbit interaction scales quadratically with spin-orbit coupling strength and shows a precession pattern. On the other hand, the term obtained from Dirac part scales linearly with the spin-orbit strength and conserves the z-component of the spin.

The competition between the Dirac-like and Rashba spin-orbit terms is of particular interest. We find that for realistic material parameters the Dirac-like terms can influence the action of Rashba spin-orbit interactions and lead to the enhancement of the spin-Hall conductance.

We acknowledge the financial support by German DFG grant HA 5893/1-1.

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DPG-Physik > DPG-Verhandlungen > 2010 > Regensburg