Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 39: Phase transitions

O 39.3: Talk

Tuesday, March 23, 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)