Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 11: Elektronische Struktur (Experiment und Theorie) I

O 11.3: Vortrag

Montag, 8. März 2004, 16:15–16:30, H44

Global electronic structure and charge-density-wave mechanism in 2H-TaSe2 — •Kai Rossnagel1,2, Eli Rotenberg1, N.V. Smith1, O. Seifarth2, and L. Kipp21Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA — 2Institut für Experimentelle und Angewandte Physik, Universität Kiel, D–24098 Kiel, Germany

The simple layered charge-density-wave system 2H-TaSe2 has received renewed interest recently because it may share important physical properties with the high-temperature superconducting cuprates, such as quasi-two-dimensionality, qualitatively similar resisitivity curves and optical responses, saddle bands close to the chemical potential, and a possible correlation between the opening of a gap on parts of the Fermi surface and the occurence of a strong energy renormalization on ungapped parts.

We present here a detailed angle-resolved photoelectron spectroscopy study of the near-EF electronic structure of 2H-TaSe2, focusing on Fermi surface topology, energy gaps, and band renormalization effects. Our results provide important clues as to the similarities to the electronic structure of cuprates and the origin of the still-debated charge-density-wave mechanism in 2H-TaSe2.

The experiments were carried out at the Electronic Structure Factory at beamline 7 of the Advanced Light Source in Berkeley. K.R. gratefully acknowledges support by the Alexander von Humboldt Foundation. Work at the University of Kiel is supported by DFG Forschergruppe FOR 353.

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