Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.18: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Effects of structural modulations on the quasiparticle distribution in 2H-TaSe₂ — •Torben Hänke¹, Alexander Kordyuk¹, Volodymyr Zabolotnyy¹, Daniil Evtushinsky¹, Paul Sass¹, Christian Hess¹, Sergey Borisenko¹, Helmut Berger², and Bernd Büchner¹ — ¹IFW Dresden, Institute for Solid State Research, P.O. Box 270116, D-01171 Dresden, Germany — ²Institut de Physique Appliquée, EPF, 1015 Lausanne, Switzerland

We report on a temperature dependent scanning tunneling microscopy (STM) and angle resolved photoemission (ARPES) study of the Cu intercalated dichalcogenide 2H-TaSe₂. The Cu intercalation leads not only to a lowering of the transition temperature into the commensurate charge-density wave state (CDW) but also to the formation of a √13×√13 superstructure, previously observed for the 1T polytype only [1]. The origin, spectroscopic appearance, and influence of these superstructures on the electronic properties of 2H-TaSe₂ will be discussed.

[1] D. Stoltz et al., Phys. Rev. B 76 073410 (2007).