Spin-polarization in a 3-terminal conductor induced by Rashba spin-orbit coupling

M. Yamamoto, J. Ohea, T. Ohtsuki, J. Nitta, B. Kramer

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We investigate numerically the spin polarization of the current in the presence of Rashba spin-orbit interaction (RSOI) in a 3-terminal conductor. We use equation-of-motion method to simulate the time evolution of the wave packet and focus on single-channel transport. A T-shaped conductor with uniform RSOI proposed by Kiselev and Kim and a Y-shaped conductor with nonuniform RSOI are considered. In the T-shaped conductor, the strength of RSOI is assumed to be uniform. We have found that the spin polarization becomes nearly 100% with little loss of conductance for sufficiently strong spin-orbit coupling. This is due to the spin-dependent group velocity of electrons at the junction which causes the spin separation. In the Y-shaped conductor, the strength of RSOI is modulated perpendicular to the charge current. A spatial gradient of effective magnetic field due to the nonuniform RSOI causes the Stern-Gerlach type spin separation. The direction of the polarization is perpendicular to the current and parallel to the spatial gradient. Again almost 100% spin polarization can be realized by this spin separation.

Original languageEnglish
Pages (from-to)490-494
Number of pages5
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number3-4
Publication statusPublished - 2005 Nov
Externally publishedYes


  • A 3-terminal conductor
  • Rashba spin-orbit interaction
  • Spin polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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