Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Poster Monday: Electronic Structure
O 20.8: Poster
Montag, 1. April 2019, 17:45–20:00, Poster F
Observation of surface and bulk charge density waves in LaTe3 — Shuvam Sarkar1, Pampa Sadhukhan1, •Davide Curcio2, Marco Bianchi2, Arnab Pariari3, Shubhankar Roy3, Prabhat Mandal3, Philip Hofmann2, and Sudipta Roy Barman1 — 1UGC-DAE Consortium for Advanced Scientific Research, Indore, India — 2Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark — 3Saha Institute of Nuclear Physics, Kolkata, India
LaTe3 is a model Charge Density Wave (CDW) material of the rare-earth tritelluride family, with an anisotropic CDW that has a transition temperature higher than 450 K [1]. The layered structure is furthermore anisotropic, resulting in a CDW that is preferentially one dimensional: A large bandgap of 0.4 eV exists along one direction, but at the same time metallic states are present in the perpendicular direction even below the CDW transition temperature [2].
The spectral function of this material has been measured by angle resolved photoelectron spectroscopy (ARPES), including the k⊥ dispersion, giving access to the full 3-dimensional band structure.
In this experimental ARPES study, we show how the CDW can be largely accounted for by nesting of wave vectors at the Fermi surface.
[1] N. Ru et al., Phys. Rev. B 77, 035114 (2008)
[2] V. Brouet et al., Phys. Rev. B 77, 235104 (2008)