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The evolution of the charge carrier concentrations and mobilities areexamined across the charge-density-wave (CDW) transition in TiSe2. Combinedquantum oscillation and magnetotransport measurements show that a smallelectron pocket dominates the electronic properties at low temperatures whilstan electron and hole pocket contribute at room temperature. At the CDWtransition, an abrupt Fermi surface reconstruction and a minimum in theelectron and hole mobilities are extracted from two-band and Kohler analysis ofmagnetotransport measurements. The minimum in the mobilities is associated withthe overseen role of scattering from the softening CDW mode. With the carrierconcentrations and dynamics dominated by the CDW and the associated bosonicmode, our results highlight TiSe2 as a prototypical system to study the Fermisurface reconstruction at a density-wave transition.

Fermi surface reconstruction and electron dynamics at the charge-density-wave transition in TiSe2