Magnetoconductance of a two-dimensional metal in the presence of spin-orbit coupling
Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany
2 NEST-INFM e Dipartimento di Fisica, Università di Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
Corresponding author: a email@example.com
Published online: 15 February 2002
We show that in the metallic phase of a two dimensional electron gas the spin-orbit coupling due to structure inversion asymmetry leads to a characteristic anisotropy in the magnetoconductance. Within the assumption that the metallic phase can be described by a Fermi liquid, we compute the conductivity in the presence of an in-plane magnetic field. Both the spin-orbit coupling and the Zeeman coupling with the magnetic field give rise to two spin subbands, in terms of which most of the transport properties can be discussed. The strongest conductivity anisotropy occurs for Zeeman energies of the order of the Fermi energy corresponding to the depopulation of the upper spin subband. The energy scale associated with the spin-orbit coupling controls the strength of the effect. More in particular, we find that the detailed behavior and the sign of the anisotropy depends on the underlying scattering mechanism. Assuming small angle scattering to be the dominant scattering mechanism our results agree with recent measurement on Si-MOSFET's in the vicinity of the metal-insulator transition.
PACS: 72.10.-d – Theory of electronic transport; scattering mechanisms / 72.20.My – Galvanomagnetic and other magnetotransport effects / 72.25.Ba – Spin polarized transport in metals
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002