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 language | English |
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Article number | A60 |
Journal | Physical Review B |
Volume | 104 |
Issue number | 16 |
Early online date | 15 Oct 2021 |
DOIs | |
Publication status | Published - 15 Oct 2021 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics