Tunable spin polarization in bismuth ultrathin film on Si(111)

Akari Takayama, Takafumi Sato, Seigo Souma, Tamio Oguchi, Takashi Takahashi

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

We performed a spin- and angle-resolved photoemission spectroscopy of bismuth ultrathin film on Si(111) with various film thickness d. We found that the spin polarization of spin-split Rashba surface states near the Brillouin-zone boundary, which is high (0.7) at d = 40 BL (bilayers), is gradually reduced on decreasing d and almost vanishes at d = 8 BL. This finding provides a novel method to generate spin-polarized electrons with tunable spin-polarization.

Original languageEnglish
Pages (from-to)1776-1779
Number of pages4
JournalNano Letters
Volume12
Issue number4
DOIs
Publication statusPublished - 2012 Apr 11
Externally publishedYes

Fingerprint

Bismuth
Spin polarization
Ultrathin films
bismuth
Surface states
polarization
Photoelectron spectroscopy
Film thickness
Electrons
Brillouin zones
film thickness
photoelectric emission
spectroscopy
electrons

Keywords

  • bismuth
  • photoemission spectroscopy
  • Rashba metal
  • spin-orbit coupling
  • Spintronics

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Takayama, A., Sato, T., Souma, S., Oguchi, T., & Takahashi, T. (2012). Tunable spin polarization in bismuth ultrathin film on Si(111). Nano Letters, 12(4), 1776-1779. https://doi.org/10.1021/nl2035018

Tunable spin polarization in bismuth ultrathin film on Si(111). / Takayama, Akari; Sato, Takafumi; Souma, Seigo; Oguchi, Tamio; Takahashi, Takashi.

In: Nano Letters, Vol. 12, No. 4, 11.04.2012, p. 1776-1779.

Research output: Contribution to journalArticle

Takayama, A, Sato, T, Souma, S, Oguchi, T & Takahashi, T 2012, 'Tunable spin polarization in bismuth ultrathin film on Si(111)', Nano Letters, vol. 12, no. 4, pp. 1776-1779. https://doi.org/10.1021/nl2035018
Takayama, Akari ; Sato, Takafumi ; Souma, Seigo ; Oguchi, Tamio ; Takahashi, Takashi. / Tunable spin polarization in bismuth ultrathin film on Si(111). In: Nano Letters. 2012 ; Vol. 12, No. 4. pp. 1776-1779.
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