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

Abstract

<p>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.</p>

Topics

• impedance spectroscopy
• dispersion
• surface
• compound
• texture
• two-dimensional
• band structure