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Phys Rev Lett. 2006 Mar 31;96(12):126103. Epub 2006 Mar 28.

Observation of a Mott insulating ground state for Sn/Ge(111) at low temperature.

Author information

  • 1Departamento de Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain.

Abstract

We report an investigation on the properties of 0.33 ML of Sn on Ge(111) at temperatures down to 5 K. Low-energy electron diffraction and scanning tunneling microscopy show that the (3x3) phase formed at approximately 200 K, reverts to a new ((square root 3)x(square root 3))R30 degrees phase below 30 K. The vertical distortion characteristic of the (3x3) phase is lost across the phase transition, which is fully reversible. Angle-resolved photoemission experiments show that, concomitantly with the structural phase transition, a metal-insulator phase transition takes place. The ((square root 3)x(square root 3))R30 degrees ground state is interpreted as the formation of a Mott insulator for a narrow half-filled band in a two-dimensional triangular lattice.

PMID:
16605931
[PubMed]
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