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HL: Halbleiterphysik

HL 29: Transport properties II

HL 29.1: Vortrag

Mittwoch, 29. März 2006, 17:00–17:15, HSZ 01

Magnetotransport in solids with spin splitting of the energy spectrum — •Nikita Averkiev, M.M. Glazov, N.I. Sablina, and S.A. Tarasenko — A.F.Ioffe Physico-Technical Institute, 194021 St.Petersburg, Russia

Spin-dependent and transport phenomena are the topical fields of solid state physics. The electron spin can be used in the future quantum computers and other information processing devices. Study of the conductivity oscillations (Shubnikov-de Haas effect) gives an unique opportunity to investigate the fundamental properties of condensed matter and structure characterization. In this presentation we analyze the magnetotransport in low-dimensional structures where the spin dynamics becomes important and determines the pattern of the Shubnikov-de Haas oscillations. Both cases: (i) zero-field spin splitting and (ii) Zeeman effect in external field are studied in detail. We show that in the first case the pattern of magnetooscillations depends drastically on the ratio between spin-orbit terms caused by structure and bulk inversion asymmetry. Depending on this ratio, the spectrum of the Shubnikov-de Haas oscillations contains one, two, or three harmonics. Such a behavior is caused by the magnetic breakdown between the spin branches. Zeeman splitting, that becomes pronounced in tilted magnetic field, can result in suppression of the main harmonic and appearance of the oscillations at double frequency. The effects described open new possibilities to investigate the fine energy structure of low-dimensional conducting systems.