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

49 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

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Keywords

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

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