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HL: Fachverband Halbleiterphysik
HL 35: Poster I
HL 35.1: Poster
Dienstag, 8. März 2016, 15:00–19:00, Poster A
Properties and definitions of the spin current — •Thorsten Arnold1, Vidar Gudmundsson2, and Frank Ortmann1 — 1Institute for Materials Science and Dresden Center for Computational Materials Science, TU Dresden, Germany — 2Science Institute, University of Iceland, Iceland
As opposed to the charge, the spin is not conserved in systems, where spin-orbit interaction or magnetic fields are present. As a consequence, the definition of the spin current is not unique and several suggestions for the definition of the spin current have been proposed [1-3]. The Rashba spin current [3] and the definition ĵα=1/2[ σαv+ v σα] agree for many systems [4]. We use the latter definition to describe a spin current in a tight-binding model to calculate the spin conductivity. We show the spin current in an Aharonov-Casher ring as well as the energy and time resolved spin conductivity in graphene, which we compare to spin relaxation properties of graphene [5].
[1] J. Shi et al., Phys. Rev. Lett. 96, 076604 (2006).
[2] N. Bray-Ali, and Z. Nussinov, Phys. Rev. B 80, 012401 (2009).
[3] E.I. Rashba, Phys. Rev. B 68, 241315 (2003).
[4] T. Arnold et al., Eur. Phys. J. B 87, 113 (2014).
[5] D. V. Tuan et al., Nature Physics 10, 857 (2014).