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HL: Fachverband Halbleiterphysik

HL 7: Spintronics I (joined session with TT)

HL 7.5: Vortrag

Montag, 20. März 2017, 10:30–10:45, POT 151

Toward accurate calculation of diffusive spin transport starting from realistic Hamiltonians. Applications to electrons, excitons, and topological insulators. — •Vincent Sacksteder¹ and Yasufumi Araki² — ¹W155 Wilson Building, Royal Holloway University of London, Egham Hill, Egham, TW20 0EX, United Kingdom — ²Creative Interdisciplinary Research Division, Tohoku University

Spin-orbit couplings, in the presence of an electric current, can generate strong spin currents with possible applications to magnetic domain switching in new memory devices. This talk will focus on a coarse-graining strategy which starts from realistic Hamiltonians describing spin and scattering at the atomic scale, and derives spin diffusion equations suitable for modeling a spintronics device. After reviewing the standard formalism, we outline how spin diffusion coefficients can be calculated either analytically or numerically, in either magnetized or unmagnetized systems. We present results for spin lifetimes, spin polarization production, and characteristic spatial patterns in electron gases, excitons, and topological insulators.