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arXiv · 1111.0890

Dynamical cluster approximation within an augmented plane-wave framework: Spectral properties of SrVO$_3$

Hunpyo Lee·Kateryna Foyevtsova·Johannes Ferber·Markus Aichhorn·Harald O. Jeschke·Roser Valenti
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Abstract

We present a combination of local density approximation (LDA) with the dynamical cluster approximation (LDA+DCA) in the framework of the full-potential linear augmented plane-wave method, and compare our LDA+DCA results for SrVO$_3$ to LDA with the dynamical mean field theory (LDA+DMFT) calculations as well as experimental observations on SrVO$_3$. We find a qualitative agreement of the momentum resolved spectral function with angle-resolved photoemission spectra (ARPES) and former LDA+DMFT results. As a correction to LDA+DMFT, we observe more pronounced coherent peaks below the Fermi level, as indicated by ARPES experiments. In addition, we resolve the spectral functions in the ${\bf K}_{0}=(0,0,0)$ and ${\bf K}_{1}=(\pi,\pi,\pi)$ sectors of DCA, where band insulating and metallic phases coexist. Our approach can be applied to correlated compounds where not only local quantum fluctuations but also spatial fluctuations are important.

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Hunpyo Lee, Kateryna Foyevtsova, Johannes Ferber, Markus Aichhorn, Harald O. Jeschke, Roser Valenti. 2011-11-03. Dynamical cluster approximation within an augmented plane-wave framework: Spectral properties of SrVO$_3$. https://doi.org/10.1103/physrevb.85.165103

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