Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 16: Poster Ia
HL 16.12: Poster
Friday, March 4, 2005, 16:30–19:00, Poster TU E
Mesoscopic spin filtering effect in the nonuniform spin-orbit interaction — •Jun-ichiro Ohe1, Masayuki Yamamoto1, Tomi Ohtsuki2, Junsaku Nitta3, and Bernhard Kramer1 — 1Hamburg University — 2Sophia University, Japan — 3NTT Basic Research Lab. and CREST-JST, Japan
Novel spin filtering in two-dimensional electron systems with nonuniform spin-orbit interactions (SOI) is numerically investigated. The strength of SOI is modulated perpendicular to the charge current. A spatial gradient of effective magnetic field due to the nonuniform SOI causes the Stern-Gerlach type spin separation. The direction of the polarization is perpendicular to the current and parallel to the spatial gradient. Almost 100 % spin polarization can be realized even without any external magnetic field and ferromagnetic contacts. The spin polarization persists even in the presence of randomness.