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TT: Fachverband Tiefe Temperaturen

TT 3: CE: Charge Density Wave \& Peierls Instability

TT 3.7: Talk

Monday, March 14, 2011, 12:15–12:30, HSZ 304

The influence of conduction band population on the charge density wave phase of TiSe₂ — •Matthias M. May^1,2, Isaak Unger¹, Christoph Janowitz¹, and Recardo Manzke¹ — ¹Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

The origin of the charge density wave (CDW) phase transition of the transition-metal dichalcogenide TiSe₂ has been subject of research for more than 30 years now with a recent tendency towards an excitonic model [1]. This view was probed by investigating the influence of an additional population of the Ti 3d conduction band. The population was realised by means of band bending due to H₂O adsorption [2] and band gap engineering via ternary compounds, monitored with ARPES at BESSY as well as conductivity measurements. Results indicate the existence of an optimal size for the band gap.

[1] C. Monney, C. Battaglia, E.F. Schwier, C. Didiot, M.G. Garnier, H. Beck, P. Aebi and H. Berger, Physica B 404, 3172 (2009)

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