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Electronic band structure of a Tl/Sn atomic sandwich on Si(111) D. V. Gruznev, L. V. Bondarenko, A. V. Matetskiy [et.al.]

Contributor(s): Gruznev, Dimitry V | Matetskiy, Andrey V | Tupchaya, Alexandra Yu | Alekseev, A. A | Hsing, Cheng-Rong | Wei, Ching-Ming | Eremeev, Sergey V | Zotov, Andrey V | Saranin, Alexander A | Bondarenko, Leonid VMaterial type: ArticleArticleSubject(s): тантал | олово | электронная структура | кремний | Ферми уровеньGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review B Vol. 91, № 3. P. 035421-1-035421-7Abstract: 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.
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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.

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