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Scanning tunneling microscopy at multiple voltage biases of stable “ring-like” Ag clusters on Si(111)–(7 × 7)

Mariotti, Nicolas ; Didiot, Clément ; Schwier, Eike Fabian ; Monney, Claude ; Perret-Aebi, Laure-Emmanuelle ; Battaglia, Corsin ; Garnier, M.G. ; Aebi, Philipp

In: Surface Science, 2012, vol. 606, no. 23-24, p. 1755-1759

Since more than twenty years it is known that deposition of Ag onto Si(111)–(7 × 7) leads under certain conditions to the formation of so-called “ring-like” clusters, that are particularly stable among small clusters. In order to resolve their still unknown atomic structure, we performed voltage dependent scanning tunneling microscopy (STM) measurements providing interesting...

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Temperature dependence of the excitonic insulator phase model in 1T-TiSe₂

Monney, Claude ; Cercellier, H. ; Battaglia, Corsin ; Schwier, Eike Fabian ; Didiot, Clément ; Garnier, M.G. ; Beck, Hans ; Aebi, Philipp

In: Physica B: Condensed Matter, 2009, vol. 404, no. 19, p. 3172-3175

Recently, detailed calculations of the excitonic insulator phase model adapted to the case of 1T-TiSe2 have been presented. Through the spectral function theoretical photoemission intensity maps can be generated which are in very good agreement with experiment [H. Cercellier, et al., Phys. Rev. Lett. 99 (2007) 146403]. In this model, excitons condensate in a BCS-like manner and give rise to a...

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