http://dspace-roma3.caspur.it:80 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. 2013-05-22T20:30:09Z http://hdl.handle.net/2307/75 <Title>Magneto-spin Hall conductivity of a two-dimensional electron gas</Title> <Authors>Milletarì, Mirco; Raimondi, Roberto; Schwab, Peter</Authors> <Issue Date>2008-06-05T08:13:23Z</Issue Date> <Is part of>Europhysics Letters</Is part of> <Volume>82</Volume> <Pages>67005</Pages> <Abstract>It is shown that the interplay of long-range disorder and in-plane magnetic field gives rise to an out-of-plane spin polarization and a finite spin Hall conductivity of the two-dimensional electron gas in the presence of Rashba spin-orbit coupling. A key aspect is provided by the electric-field–induced in-plane spin polarization. Our results are obtained first in the clean limit where the spin-orbit splitting is much larger than the disorder broadening of the energy levels via the diagrammatic evaluation of the Kubo formula. Then the results are shown to hold in the full range of the disorder parameter αpFτ by means of the quasiclassical Green function technique.</Abstract> 2008-06-05T08:13:23Z http://hdl.handle.net/2307/267 <Title>Spin Hall effect in a 2DEG in the presence of magnetic couplings</Title> <Authors>Gorini, Cosimo; Schwab, Peter; Dzierzawa, Michael; Raimondi, Roberto; Milletarì, Mirco</Authors> <Issue Date>2009-02</Issue Date> <Pages>1-4</Pages> <Abstract>It is now well established that the peculiar linear-in-momentum dependence of the Rashba (and of the Dresselhaus) spin-orbit coupling leads to the vanishing of the spin Hall conductivity in the bulk of a two-dimensional electron gas (2DEG). In this paper we discuss how generic magnetic couplings change this behaviour providing then a potential handle on the spin Hall effect. In particular we examine the influence of magnetic impurities and an in-plane magnetic field. We find that in both cases there is a finite spin Hall effect and we provide explicit expressions for the spin Hall conductivity. The results can be obtained by means of the quasiclassical Green function approach, that we have recently extended to spin-orbit coupled electron systems.</Abstract> 2009-01-31T23:00:00Z