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Author Wójcik, P. ♦ Adamowski, J. ♦ Wołoszyn, M. ♦ Spisak, B. J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ BEAMS ♦ CRYSTALS ♦ CURRENTS ♦ ELECTRIC CONTACTS ♦ L-S COUPLING ♦ MAGNETIC FIELDS ♦ NANOSTRUCTURES ♦ POLARIZATION ♦ SEMICONDUCTOR MATERIALS ♦ SPIN ♦ SPIN ORIENTATION ♦ VISIBLE RADIATION ♦ ZEEMAN EFFECT
Abstract We have studied the spin splitting of the current in the Y-shaped semiconductor nanostructure with a quantum point contact (QPC) in a perpendicular magnetic field. Our calculations show that the appropriate tuning of the QPC potential and the external magnetic field leads to an almost perfect separation of the spin-polarized currents: electrons with opposite spins flow out through different output branches. The spin splitting results from the joint effect of the QPC, the spin Zeeman splitting, and the electron transport through the edge states formed in the nanowire at the sufficiently high magnetic field. The Y-shaped nanostructure can be used to split the unpolarized current into two spin currents with opposite spins as well as to detect the flow of the spin current. We have found that the separation of the spin currents is only slightly affected by the Rashba spin-orbit coupling. The spin-splitter device is an analogue of the optical device—the birefractive crystal that splits the unpolarized light into two beams with perpendicular polarizations. In the magnetic-field range, in which the current is carried through the edges states, the spin splitting is robust against the spin-independent scattering. This feature opens up a possibility of the application of the Y-shaped nanostructure as a non-ballistic spin-splitter device in spintronics.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-07-07
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 118
Issue Number 1


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