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Temperature evolution of the 2H-TaSe2 Fermi surface (FS) is studied byhigh-resolution angle-resolved photoemission spectroscopy (ARPES).High-accuracy determination of the FS geometry was possible after measuringelectron momenta and velocities along all high-symmetry directions as afunction of temperature with subsequent fitting to a tight-binding model. Theestimated incommensurability parameter of the nesting vector agrees with thatof the incommensurate charge modulations. We observe detectable nonmonotonictemperature dependence of the FS shape, which we show to be consistent with theanalogous behavior of the pseudogap. These changes in the electronic structurecould stem from the competition of commensurate and incommensurate chargedensity wave order fluctuations, explaining the puzzling reopening of thepseudogap observed in the normal state of both transition metal dichalcogenidesand high-Tc cuprates.

Temperature-dependent Fermi surface of 2H-TaSe2 driven by competing density wave order fluctuations