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26 April 2024 |
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Observation of a Mott insulating ground state for Sn/Ge(111) at low temperature | | R Cortés
; A Tejeda
; J Lobo
; C Didiot
; B Kierren
; D Malterre
; E G Michel
; A Mascaraque
; | | Date: |
31 Mar 2006 | | Journal: | Phys Rev Lett, 96 (12), 126103 | | 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. | | Source: | PubMed, pmid16605931 | | Services: | Forum | Review | Favorites | |
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