Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-10-22
Eur. Phys. J. B 25, 483-495 (2002)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 12 Figures, RevTeX, submitted to EPJ B
Scientific paper
10.1140/epjb/e20020054
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.
Raimondi Roberto
Schwab Peter
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