2024-03-28T13:24:19Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/446112018-09-13T09:45:13Zcom_10261_2855com_10261_4col_10261_2857
Gelabert, M. M.
Serra, Llorenç
2012-01-23T15:17:30Z
2012-01-23T15:17:30Z
2011
European Physical Journal B 79: 341–349 (2011)
1434-6028
http://hdl.handle.net/10261/44611
10.1140/epjb/e2010-10767-6
1434-6036
We investigate the linear conductance of a stripe of spin-orbit interaction in a 2D electron gas;
that is, a 2D region of length along the transport direction and infinite in the transverse one in which
a spin-orbit interaction of Rashba type is present. Polarization in the contacts is described by means of
Zeeman fields. Our model predicts two types of conductance oscillations: Ramsauer oscillations in the
minority spin transmission, when both spins can propagate, and Fano oscillations when only one spin
propagates. The latter are due to the spin-orbit coupling with quasibound states of the non propagating
spin. In the case of polarized contacts in antiparallel configuration Fano-like oscillations of the conductance
are still made possible by the spin orbit coupling, even though no spin component is bound by the contacts.
To describe these behaviors we propose a simplified model based on an ansatz wave function. In general,
we find that the contribution for vanishing transverse momentum dominates and defines the conductance
oscillations. Regarding the oscillations with Rashba coupling intensity, our model confirms the spin transistor behavior, but only for high degrees of polarization. Including a position dependent effective mass
yields additional oscillations due to the mass jumps at the interfaces
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openAccess
Conductance oscillations of a spin-orbit stripe with polarized contacts
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