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.

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.

Included in

Physics Commons

Share

COinS