Signatures of the charge density wave collective mode in the infrared optical response of VSe2

Xuanbo Feng, Jans Henke, Corentin Morice, Charles J. Sayers, Enrico Da Como, Jasper Van Wezel, Erik Van Heumen

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3 Citations (SciVal)

Abstract

We present a detailed study of the bulk electronic structure of high-quality VSe2 single crystals using optical spectroscopy. Upon entering the charge density wave phase below the critical temperature of 112 K, the optical conductivity of VSe2 undergoes a significant rearrangement. A Drude response present above the critical temperature is suppressed while a new interband transition appears around 0.07 eV. From our analysis, we estimate that part of the spectral weight of the Drude response is transferred to a collective mode of the CDW phase. The remaining normal-state charge dynamics appears to become strongly damped by interactions with the lattice as evidenced by a mass enhancement factor m∗/m≈3. In addition to the changes taking place in the electronic structure, we observe the emergence of infrared active phonons below the critical temperature associated with the 4a×4a lattice reconstruction.

Original languageEnglish
Article numberA60
JournalPhysical Review B
Volume104
Issue number16
Early online date15 Oct 2021
DOIs
Publication statusPublished - 15 Oct 2021

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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