Tunable spin polarization in bismuth ultrathin film on Si(111).
basic_science · Level V
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- Record sourced from PubMed, PMID 22448971.
- Also identified by DOI 10.1021/nl2035018.
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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.