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Title: Quasiparticle self-consistent G W calculations of the electronic band structure of bulk and monolayer V 2 O 5

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics

Quasiparticle self-consistent (QS) GW calculations are performed for bulk and monolayer V2O5. The orbital character of the bands and the bulk monolayer difference at the LDA level are discussed first. We discover that the QSGW self-energy overestimates the gap by an unusually large amount. The main reason for this is identified to be the lattice polarization effect: The large LO-TO splittings in this polar material enhance the screening and reduce the screened Coulomb interaction affecting the gap. Moreover, the effect is estimated to reduce the screened Coulomb interaction and hence the self-energy by a factor 0.38 (for bulk) and brings the calculated optical response functions in fairly good agreement with experiment. For monolayer V2O5 we find that the QSGW gap varies as 1/L with L the size of the spacing between the monolayers in a supercell. This results from the long-range nature of the self-energy Σ=iGW and the similar 1/L behavior of the dielectric screening.

Research Organization:
Case Western Reserve Univ., Cleveland, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
SC0008933; ER-46874-SC0008933
OSTI ID:
1593458
Alternate ID(s):
OSTI ID: 1180585
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 12; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (8)

Electrochemically Generated γ‐Li x V 2 O 5 as Insertion Host for High‐Energy Li‐Ion Capacitors journal August 2019
Solar‐Inspired Water Purification Based on Emerging 2D Materials: Status and Challenges journal January 2020
Exploration of organic additives-assisted vanadium pentoxide (V2O5) nanoparticles for Cu/n-V2O5/p-Si Schottky diode applications journal November 2019
Two-Dimensional Transition Metal Oxide and Chalcogenide-Based Photocatalysts journal December 2017
Mapping polaronic states and lithiation gradients in individual V2O5 nanowires journal June 2016
Quasiparticle self-consistent GW band structure of β -Ga 2 O 3 and the anisotropy of the absorption onset journal March 2017
Ultraviolet photocatalytic degradation of methyl orange by nanostructured TiO 2 /ZnO heterojunctions journal January 2015
Automation methodologies and large-scale validation for $GW$, towards high-throughput $GW$ calculations text January 2017

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