Fermi Surface Reconstruction and Electron Dynamics at the Charge-Density-Wave Transition in TiSe2

Patrick Knowles, Bo Yang, Takaki Muramatsu, Owen Moulding, Jonathan Buhot, Charles Sayers, Enrico Da Como, Sven Friedemann

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Abstract

The evolution of the charge carrier concentrations and mobilities are examined across the charge-density-wave (CDW) transition in TiSe2. Combined quantum oscillation and magnetotransport measurements show that a small electron pocket dominates the electronic properties at low temperatures while an electron and hole pocket contribute at room temperature. At the CDW transition, an abrupt Fermi surface reconstruction and a minimum in the electron and hole mobilities are extracted from two-band and Kohler analysis of magnetotransport measurements. The minimum in the mobilities is associated with the overseen role of scattering from the softening CDW mode. With the carrier concentrations and dynamics dominated by the CDW and the associated bosonic mode, our results highlight TiSe2 as a prototypical system to study the Fermi surface reconstruction at a density-wave transition.
Original languageEnglish
Article number167602
JournalPhysical Review Letters
Volume124
Issue number16
DOIs
Publication statusPublished - 24 Apr 2020

Keywords

  • Charge density waves
  • Transition metal dichalcogenides
  • Phase transitions
  • Electronic structure
  • Magnetotransport
  • Quantum oscillations
  • Excitons

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