Transverse magneto-conductivity of diluted magnetic semicon-ductor quantum wires

We calculated the transverse dc electrical conductivity of a quasi‐one‐dimensional semiconductor quantum wire in a magnetic field normal to the barriers of the wire, and studied the electron‐magnon interaction in DMS using linear response theory. The electron gas was assumed as quasi‐one‐dimensional, while the magnons were considered to be bulk type. The transverse dc electrical conductivity of quantum wires of diameter W (∼0.1 µm) much larger than the magnetic length lb and much smaller than the mean free path le (e.g., lb ≪ W ≪le), was modelled with a parabolic potential of frequency Ω, and leads to a shift of the magneto‐magnon resonance peaks to smaller magnetic fields. Moreover, the magneto‐conductivity σxx decreases when the confinement becomes stronger (when the wire diameter decreases). Numerical results are presented for a Ga1–xMnxAs quasi‐one‐dimensional wire, where we present the appropriate conditions for use of these structures in spintronic applications and devices. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)