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HL: Halbleiterphysik

HL 29: Spinabh
ängiger Transport I

HL 29.1: Vortrag

Mittwoch, 10. März 2004, 15:15–15:30, H13

Dephasing in Rashba–Spin precession along mutli–channel quantum wires and nanotubes — •Wolfgang Häusler — Physikalisches Institut, Albert-Ludwigs-Universität, Hermann-Herder-Str. 3, 79104 Freiburg

Coherent Rashba spin precession along interacting multi-mode quantum channels is investigated, revisiting the theory of coupled Tomonaga-Luttinger liquids, and extending the theory [1]. We identify susceptibilities as the key-parameters to govern all low energy properties, also in spin sector. In semiconducting quantum wires spins of different transport channels are found to dephase as a result of the interaction. This could explain the experimental difficulty to realize the Datta Das transistor. In single wall carbon nanotubes, on the other hand, interactions are found to suppress dephasing between the two flavor modes at small doping.

[1] W. Häusler, Phys. Rev. B 63, 121310 (2001)