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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationUltrafast Phenomena in Semiconductors and Nanostructure Materials XIV
DOIs
Publication statusPublished - 2010 May 3
EventUltrafast Phenomena in Semiconductors and Nanostructure Materials XIV - San Francisco, CA, United States
Duration: 2010 Jan 242010 Jan 27

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7600
ISSN (Print)0277-786X

Other

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

Keywords

  • In-plane magnetic field
  • Spin orbit interaction
  • Spin polarized current
  • Stern-Gerlach spin filter

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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