Efficient spin filter using multi-terminal quantum dot with spin-orbit interaction

Tomohiro Yokoyama, Mikio Eto

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We propose a multi-terminal spin filter using a quantum dot with spin-orbit interaction. First, we formulate the spin Hall effect (SHE) in a quantum dot connected to three leads. We show that the SHE is significantly enhanced by the resonant tunneling if the level spacing in the quantum dot is smaller than the level broadening. We stress that the SHE is tunable by changing the tunnel coupling to the third lead. Next, we perform a numerical simulation for a multi-terminal spin filter using a quantum dot fabricated on semiconductor heterostructures. The spin filter shows an efficiency of more than 50% when the conditions for the enhanced SHE are satisfied.

Original languageEnglish
Article number436
Pages (from-to)1-7
Number of pages7
JournalNanoscale Research Letters
Volume6
DOIs
Publication statusPublished - 2011

Fingerprint

Spin Hall effect
spin-orbit interactions
Semiconductor quantum dots
Orbits
quantum dots
filters
Hall effect
Resonant tunneling
Heterojunctions
Tunnels
Lead
Semiconductor materials
resonant tunneling
Computer simulation
tunnels
spacing

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Efficient spin filter using multi-terminal quantum dot with spin-orbit interaction. / Yokoyama, Tomohiro; Eto, Mikio.

In: Nanoscale Research Letters, Vol. 6, 436, 2011, p. 1-7.

Research output: Contribution to journalArticle

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