Charge-density-wave formation by Van Hove nesting in the α-phase of Sn/Ge(111)
- 15 September 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 62 (11) , 6928-6931
- https://doi.org/10.1103/physrevb.62.6928
Abstract
We study the role of electron correlations in the formation of the surface charge-density-wave state in the Sn/Ge(111) interface. The Fermi energy of the overlayer is treated as a dynamical variable, which undergoes a substantial renormalization by the interaction. We show that the Fermi level turns out to be pinned to a Van Hove singularity in the density of states, which explains the formation of the charge density wave, the observation of a very flat band in photoemission experiments, and the reduction of the spectral weight in the low-temperature phase.Keywords
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