Electronic band structure of a Tl/Sn atomic sandwich on Si(111)

D. V. Gruznev, L. V. Bondarenko, A. V. Matetskiy, A. Y. Tupchaya, A. A. Alekseev, C. R. Hsing, C. M. Wei, S. V. Eremeev, A. V. Zotov, A. A. Saranin

Research output: Contribution to journalJournal Article peer-review

24 Scopus citations

Abstract

A two-dimensional compound made of one monolayer of Tl and one monolayer of Sn on Si(111) has been found to have a sandwichlike structure in which the Sn layer (having the milk-stool arrangement) resides on the bulklike terminated Si(111) surface and the Tl layer (having the honeycomb-chained-trimer arrangement) is located above the Sn layer. The electronic band structure of the compound contains two spin-split surface-state bands, of which one is nonmetallic and the other is metallic. Near the Fermi level the metallic band is split with the momentum splitting Δk ¥=0.037 Å-1 and energy splitting ΔEF=167 meV. The steep dispersion of the band when crossing the Fermi level corresponds to an electron velocity of ≈8.5×105 m/s, which is comparable to the value reported for graphene. The 2D Fermi contours have almost circular shape with spin texture typical for hexagonal surfaces.

Original languageEnglish
Article number035421
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number3
DOIs
StatePublished - 16 01 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society.

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