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- W2999864694 abstract "We present real-space quantum Monte Carlo (QMC) calculations of the scandate ${mathrm{LaScO}}_{3}$ that proved to be challenging for traditional electronic structure approaches due to strong correlation effects resulting in inaccurate band gaps from DFT and $GW$ methods when compared with existing experimental data. Besides calculating an accurate QMC band gap corrected for supercell size biases and in agreement with numerous experiments, we also predict the cohesive energy of the crystal using the standard fixed-node QMC without any empirical or nonvariational parameters. We show that promotion (optical) gap and fundamental gap agree with each other illustrating a clear absence of significant excitonic effects in the ideal crystal. We obtained these results in perfect consistency in two independent tracks that employ different basis sets (plane wave versus localized Gaussians), different codes for generating orbitals (quantum espresso versus crystal), different QMC codes (qmcpack versus qwalk) and different high-accuracy pseudopotentials (ccECPs versus Troullier-Martins) presenting the maturity and consistency of QMC methodology and tools for studies of strongly correlated problems." @default.
- W2999864694 created "2020-01-23" @default.
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- W2999864694 date "2020-07-01" @default.
- W2999864694 modified "2023-10-09" @default.
- W2999864694 title "Many-body electronic structure of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>LaScO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> by real-space quantum Monte Carlo" @default.
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- W2999864694 doi "https://doi.org/10.1103/physrevb.102.045103" @default.
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