Tunable Spin Polarization in Bismuth Ultrathin Film on Si(111)

Tunable Spin Polarization in Bismuth Ultrathin Film on Si(111)

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 r...

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Veröffentlicht in:Nano letters 2012-04, Vol.12 (4), p.1776-1779
Hauptverfasser: Takayama, Akari, Sato, Takafumi, Souma, Seigo, Oguchi, Tamio, Takahashi, Takashi
Format: Artikel
Sprache:eng
Schlagworte:
Bismuth
Boundaries
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron and ion emission by liquids and solids
impact phenomena
Exact sciences and technology
Film thickness
Interfaces, heterostructures, nanostructures
Nanostructure
Photoelectron spectroscopy
Photoemission and photoelectron spectra
Physics
Polarization
Thin films
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Zusammenfassung: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.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl2035018