Fermi surface gapping and nesting in the surface phase transition of Sn/Cu(100)
| Autor: | Martinez-Blanco, J, Joco, V, Ascolani, H, Tejeda, A, Quiros, C, Panaccione, G, Balasubramanian, T, Segovia, P, Michel, EG |
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| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Zdroj: | Physical review. B, Condensed matter and materials physics (Online) 72 (2005): 041401. doi:10.1103/PhysRevB.72.041401 info:cnr-pdr/source/autori:Martinez-Blanco, J; Joco, V; Ascolani, H; Tejeda, A; Quiros, C; Panaccione, G; Balasubramanian, T; Segovia, P; Michel, EG/titolo:Fermi surface gapping and nesting in the surface phase transition of Sn%2FCu(100)/doi:10.1103%2FPhysRevB.72.041401/rivista:Physical review. B, Condensed matter and materials physics (Online)/anno:2005/pagina_da:041401/pagina_a:/intervallo_pagine:041401/volume:72 |
| Popis: | We identify and characterize a two-dimensional phase transition in a layer of Sn on Cu(100). The stable phase at room temperature has a (3?2×?2)R45° structure. Above ~360 K, a new phase with (?2×?2)R45° structure is formed. The high-temperature phase exhibits a quasi-two-dimensional free-electron surface band, with Fermi surface nesting in excellent agreement with the three-times larger periodicity of the low-temperature phase. A momentum-dependent band gap opens along the nested areas of the Fermi surface in the low-temperature phase. The phase transition is a clear experimental confirmation of the role of Fermi-surface gapping and nesting in the stabilization of a commensurate two-dimensional phase, which is interpreted as a charge-density wave |
| Databáze: | OpenAIRE |
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