Document Type
Article
Department/Program
Physics
Journal Title
Physical Review B
Pub Date
2-2017
Volume
95
Issue
7
Abstract
We present comprehensive broadband optical spectroscopy data on two insulating phases of vanadium dioxide (VO2): monoclinic M2 and triclinic. The main result of our work is that the energy gap and the electronic structure are essentially unaltered by the first-order structural phase transition between the M2 and triclinic phases. Moreover, the optical interband features in the M2 and triclinic phases are remarkably similar to those observed in the well-studied monoclinic M1 insulating phase of VO2. As the energy gap is insensitive to the different lattice structures of the three insulating phases, we rule out vanadium-vanadium pairing (the Peierls component) as the dominant contributor to the opening of the gap. Rather, the energy gap arises primarily from intra-atomic Coulomb correlations.
Recommended Citation
Huffman, T. J.; Hendriks, C.; Walter, E. J.; ...; and Qazilbash, M. M., Insulating Phases of Vanadium Dioxide are Mott-Hubbard Insulators (2017). Physical Review B, 95(7).
https://doi.org/10.1103/PhysRevB.95.075125
DOI
https://doi.org/10.1103/PhysRevB.95.075125
Publisher Statement
This work is made available for educational and personal use only. Copyright is credited to the authors. Any other uses should be directed to the publisher.
