Spin Hall effect in clean two-dimensional electron gases with Rashba spin-orbit coupling

被引:45
作者
Reynoso, A [1 ]
Usaj, G
Balseiro, CA
机构
[1] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
[2] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
关键词
D O I
10.1103/PhysRevB.73.115342
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the spin polarization induced by a current flow in clean two-dimensional electron gases with Rashba spin-orbit coupling. This geometric effect originates from special properties of the electron's scattering at the edges of the sample. In wide samples, the spin polarization has its largest value at low energies (close to the bottom of the band) and goes to zero at higher energies. In this case, the spin polarization is dominated by the presence of evanescent modes which have an explicit spin component outside the plane. In quantum wires, on the other hand, the spin polarization is dominated by interference effects induced by multiple scattering at the edges. Here, the spin polarization is quite sensitive to the value of the Fermi energy, especially close to the point where a new channel opens up. We analyzed different geometries and found that the spin polarization can be strongly enhanced.
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页数:9
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