Weighted Density Approximation Description of Insulating YH$_3$ and LaH$_3$

Details Weighted Density Approximation Description of Insulating YH$_3$ and LaH$_3$ Weighted Density Approximation Description of Insulating YH$_3$ and LaH$_3$

2003-09-12

arxiv.org/abs/cond-mat/0309326v1

Phys. Rev. B 69, 085104 (2004)

Physics

Condensed Matter

6 Pages, 3 figures

Scientific paper

10.1103/PhysRevB.69.085104

Density functional calculations within the weighted density approximation (WDA) are presented for YH$_3$ and LaH$_3$. We investigate some commonly used pair-distribution functions G. These calculations show that within a consistent density functional framework a substantial insulating gap can be obtained while at the same time retaining structural properties in accord with experimental data. Our WDA band structures agree with those of $GW$ approximation very well, but the calculated band gaps are still 1.0-2.0 eV smaller than experimental findings.

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