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Dirac cone with helical spin polarization in ultrathin $α$-Sn(001) films

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 $\barΓ$ point of surface Brillouin zone, suggesting nearly massless electrons belonging to 2D surface states. The states disperse across a bandgap between bulk-like 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.

preprint2013arXivOpen access
Yoshiyuki OhtsuboPatrick Le FèvreFrançois BertranAmina Taleb-Ibrahimi
cond-mat.mes-hall
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Yoshiyuki OhtsuboPatrick Le FèvreFrançois BertranAmina Taleb-Ibrahimi

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