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Title: Insulating phases of vanadium dioxide are Mott-Hubbard insulators

Journal Article · · Physical Review B
 [1];  [1];  [1];  [2];  [2];  [3];  [3];  [1];  [1]
  1. College of William and Mary, Williamsburg, VA (United States)
  2. Yonsei Univ., Seoul (Republic of Korea)
  3. 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)
Grant/Contract Number:
SC00112704
OSTI ID:
1376670
Report Number(s):
BNL-114002-2017-JA; PRBMDO; TRN: US1702686
Journal Information:
Physical Review B, Vol. 95, Issue 7; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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Cited By (8)

Microscopic nature of the asymmetric hysteresis in the insulator-metal transition of VO 2 revealed by spectroscopic ellipsometry journal November 2018
How optical excitation controls the structure and properties of vanadium dioxide journal December 2018
Ultrafast response of photoexcited carriers in VO 2 at high-pressure journal August 2018
Insulator-metal transitions in the T phase Cr-doped and M 1 phase undoped VO 2 thin films journal August 2018
Electronic structure of metallic and insulating phases of vanadium dioxide and its oxide alloys journal September 2019
Modification of the Properties of Vanadium Oxide Thin Films by Plasma-Immersion Ion Implantation journal January 2018
Electronic structure of metallic and insulating phases of vanadium dioxide and its oxide alloys journalarticle January 2019
How optical excitation controls the structure and properties of vanadium dioxide text January 2018

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