Document Detail


Dirac Cone with Helical Spin Polarization in Ultrathin α-Sn(001) Films.
MedLine Citation:
PMID:  24313507     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Spin-split two-dimensional electronic states have been observed on ultrathin Sn(001) films grown on InSb(001) substrates. Angle-resolved photoelectron spectroscopy (ARPES) performed on these films revealed Dirac-cone-like linear dispersion around the Γ[over ¯] point of the surface Brillouin zone, suggesting nearly massless electrons belonging to 2D surface states. The states disperse across a band gap between bulklike quantum well states in the films. Moreover, both circular dichroism of ARPES and spin-resolved ARPES studies show helical spin polarization of the Dirac-cone-like surface states, suggesting a topologically protected character as in a bulk topological insulator (TI). These results indicate that a quasi-3D TI phase can be realized in ultrathin films of zero-gap semiconductors.
Authors:
Yoshiyuki Ohtsubo; Patrick Le Fèvre; François Bertran; Amina Taleb-Ibrahimi
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Publication Detail:
Type:  Journal Article     Date:  2013-11-19
Journal Detail:
Title:  Physical review letters     Volume:  111     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-12-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  216401     Citation Subset:  IM    
Affiliation:
Synchrotron SOLEIL, Saint-Aubin-BP 48, F-91192 Gif sur Yvette, France.
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