Proposal for electrical detection of spin separation with in-plane magnetic field in mesoscopic Stern-Gerlach spin filter

M. Kohda, J. Ohe, H. Sanada, M. Yamamoto, T. Ohtsuki, J. Nitta

研究成果: Conference contribution

抄録

In two-dimensional electron gas (2DEG), spatial gradient of effective magnetic field due to spin orbit interaction yields spin dependent force. By taking this advantage, Stern-Gerlach spin filter in 2DEG has been proposed for generating spin polarized currents without any external magnetic fields and ferromagnetic materials [Phys. Rev. B 72, 041308(R) (2005)]. In order to demonstrate the spin filtering effect, detection of spin polarized electrons becomes crucial importance. Here, we propose an electrical detection of spin filtering by introducing an in-plane magnetic field in mesoscopic Stern-Gerlach spin filter. In-plane magnetic field induces spin polarized electrons due to Zeeman splitting, generating the imbalance between up-spin and down-spin currents after the spin separation. Calculated spin separation angle becomes 20° based on experimentally accessible parameters. Time evolution of wave packet shows the spin separation as well as the charge imbalance under the in-plane magnetic field. By fabricating Y-branch shaped narrow wire structure with two split gate electrodes at the junction, spin filtering effect can be detected as the magnitude difference of each branch currents. Gate bias dependence of each branch current is measured in Bex= ±15 T at T=4.2 K.

本文言語English
ホスト出版物のタイトルUltrafast Phenomena in Semiconductors and Nanostructure Materials XIV
DOI
出版ステータスPublished - 2010 5 3
イベントUltrafast Phenomena in Semiconductors and Nanostructure Materials XIV - San Francisco, CA, United States
継続期間: 2010 1 242010 1 27

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
7600
ISSN(印刷版)0277-786X

Other

OtherUltrafast Phenomena in Semiconductors and Nanostructure Materials XIV
国/地域United States
CitySan Francisco, CA
Period10/1/2410/1/27

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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