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Fermi surface, charge-density-wave gap, and kinks in 2 H − TaSe 2

2005; American Physical Society; Volume: 72; Issue: 12 Linguagem: Inglês

10.1103/physrevb.72.121103

1550-235X

Kai Roßnagel, Eli Rotenberg, H. Koh, N. V. Smith, L. Kipp,

Iron-based superconductors research

The Fermi surface of the layered charge-density-wave compound $2H\text{\ensuremath{-}}{\mathrm{TaSe}}_{2}$ is measured by angle-resolved photoemission as a function of temperature. A surprising Fermi-surface topology and a Fermi-surface branch-dependent charge-density-wave gap are found. In the charge-density-wave state band hybridization effects are strong and responsible for kinks in the band dispersions at relatively high binding energy. The implications of the results on the charge-density-wave mechanism are discussed.