Insulating phases of vanadium dioxide are Mott-Hubbard insulators
Journal Article
·
· Physical Review B
- College of William and Mary, Williamsburg, VA (United States)
- Yonsei Univ., Seoul (Republic of Korea)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
Here, 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.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- OSTI ID:
- 1376670
- Report Number(s):
- BNL--114002-2017-JA
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 7 Vol. 95; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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