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Issue 33, 2011
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Testing variations of the GW approximation on strongly correlated transition metal oxides: hematite (α-Fe2O3) as a benchmark

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Abstract

Quantitative characterization of low-lying excited electronic states in materials is critical for the development of solar energy conversion materials. The many-body Green's function method known as the GW approximation (GWA) directly probes states corresponding to photoemission and inverse photoemission experiments, thereby determining the associated band structure. Several versions of the GW approximation with different levels of self-consistency exist in the field. While the GWA based on density functional theory (DFT) works well for conventional semiconductors, less is known about its reliability for strongly correlated semiconducting materials. Here we present a systematic study of the GWA using hematite (α-Fe2O3) as the benchmark material. We analyze its performance in terms of the calculated photoemission/inverse photoemission band gaps, densities of states, and dielectric functions. Overall, a non-self-consistent G0W0 using input from DFT+U theory produces physical observables in best agreement with experiments.

Graphical abstract: Testing variations of the GW approximation on strongly correlated transition metal oxides: hematite (α-Fe2O3) as a benchmark

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Article information


Submitted
19 Mar 2011
Accepted
21 Jun 2011
First published
14 Jul 2011

Phys. Chem. Chem. Phys., 2011,13, 15189-15199
Article type
Paper

Testing variations of the GW approximation on strongly correlated transition metal oxides: hematite (α-Fe2O3) as a benchmark

P. Liao and E. A. Carter, Phys. Chem. Chem. Phys., 2011, 13, 15189
DOI: 10.1039/C1CP20829B

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