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TT: Fachverband Tiefe Temperaturen

TT 42: Charge Order

TT 42.8: Vortrag

Dienstag, 13. März 2018, 12:15–12:30, HFT-FT 131

Three-Dimensional Fermi Surface of 2H-NbSe₂ - Implications for the Mechanism of Charge Density Waves — •Roland Hott¹, Frank Weber¹, Rolf Heid¹, Leonid L. Lev², Thorsten Schmitt², and Vladimir N. Strocov² — ¹Institute for Solid State Physics, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany — ²Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland

We investigated the three-dimensional electronic structure of the seminal charge-density-wave (CDW) material 2H-NbSe₂ by soft x-ray angle-resolved photoelectron spectroscopy and density-functional theory. Our results reveal the pronounced 3D character of the electronic structure formed in the quasi-two-dimensional layered crystal structure. In particular, we find a strong dispersion along k_z excluding a nesting-driven CDW formation based on experimental data.