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

Abstract

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 lband 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)