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Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: Phase transitions

O 39.3: Vortrag

Dienstag, 23. März 2010, 15:30–15:45, H42

Influence of H2O adsorption on the charge-density wave phase of 1T-TiSe2 — •Matthias May, Stephan Thürmer, Cristoph Janowitz, and Recardo Manzke — Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin, Germany

The transition-metal dichalcogenide TiSe2 reveals a charge-density wave (CDW) phase transition at low temperatures and the driving force of this CDW is still under discussion (see e.g. [1]). One crucial question for the microscopic origin was that on the electric character, i.e. whether TiSe2 is a semiconductor or a semimetal [1,2]. This has been answered by Rasch et al. [2] by means of angle-resolved photoemission (ARPES) and applying the effect of H2O adsorption onto the van der Waals-like surface, bending the bands and resulting in a filled lowest conduction band. These ARPES experiments were continued at BESSY investigating now the influence of H2O adsorption on the CDW transition at different temperatures. Results are discussed in context of the related theories.

[1] H. Cercellier, C. Monney, F. Clerc, C. Battaglia, L. Despont, M. G. Garnier, H. Beck, and P. Aebi, Phys. Rev. Letters 99, 146403 (2007)

[2] J. Rasch, T. Stemmler, B. Mueller, L. Dudy, and R. Manzke, Phys. Rev. Letters 101, 237602 (2008)

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