Spin Polarization at Semiconductor Point Contacts in Absence of Magnetic Field

Details Spin Polarization at Semiconductor Point Contacts in Absence of Magnetic Field Spin Polarization at Semiconductor Point Contacts in Absence of Magnetic Field

2005-04-05

arxiv.org/abs/cond-mat/0504105v2

J. Phys. Soc. Jpn. 74, 1934 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures; minor changes, published in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.74.1934

Semiconductor point contacts can be a useful tool for producing spin-polarized currents in the presence of spin-orbit (SO) interaction. Neither magnetic fields nor magnetic materials are required. By numerical studies, we show that (i) the conductance is quantized in units of 2e^2/h unless the SO interaction is too strong, (ii) the current is spin-polarized in the transverse direction, and (iii) a spin polarization of more than 50% can be realized with experimentally accessible values of the SO interaction strength. The spin-polarization ratio is determined by the adiabaticity of the transition between subbands of different spins during the transport through the point contacts.

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