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Real-Space Dynamic Electron Correlation in Beryllium

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arxiv 2601.20814 v2 pith:LVYG5ZKR submitted 2026-01-28 cond-mat.other

Real-Space Dynamic Electron Correlation in Beryllium

Rudra B. Bista , Yuya Shinohara , Wojciech Dmowski , Chae Woo Ryu , Jung Ho Kim , Mary Upton , Hlynur Gretarsson , Martin Sundermann
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Takeshi Egami
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classification cond-mat.other
keywords dynamiccorrelationelectronberylliumexchange-correlationfunctionholehowever
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Electron correlation in solid has a major impact on material properties. However, it has been studied mainly by theory, with very limited direct experimental investigations. Here, we demonstrate that dynamic electron correlation function can be experimentally measured using inelastic X-ray scattering on polycrystalline beryllium. The data are expressed as the energy-resolved dynamic pair-distribution function. Our results confirm the size of the exchange-correlation hole as ~2 {\AA}, consistent with theoretical expectations. However, at the plasmon energy of ~21 eV, the exchange-correlation hole is extended up to 4-5 {\AA}, suggesting a unique influence of the dynamic plasmon state.

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