Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-01-21
J. Phys.: Condens. Matter 19 (2007) 186227
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1088/0953-8984/19/18/186227
The effect of Rashba spin-orbit interaction in quantum wires with hard-wall boundaries is discussed. The exact wave function and eigenvalue equation are worked out pointing out the mixing between the spin and spatial parts. The spectral properties are also studied within the perturbation theory with respect to the strength of the spin-orbit interaction and diagonalization procedure. A comparison is done with the results of a simple model, the two-band model, that takes account only of the first two sub-bands of the wire. Finally, the transport properties within the ballistic regime are analytically calculated for the two-band model and through a tight-binding Green function for the entire system. Single and double interfaces separating regions with different strengths of spin-orbit interaction are analyzed injecting carriers into the first and the second sub-band. It is shown that in the case of a single interface the spin polarization in the Rashba region is different from zero, and in the case of two interfaces the spin polarization shows oscillations due to spin selective bound states.
Bercioux Dario
Cataudella Vittorio
Perroni C. A.
Ramaglia Vincenzo Marigliano
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