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- W1978045163 abstract "We study the influence of antiprotons and protons traveling through LiF on the band structure of the insulator using the embedded-cluster method. The crystal is represented by ${text{F}}_{m}^{ensuremath{-}}{text{Li}}_{n}^{+}$ clusters with up to 19 fluorine ions embedded in a lattice of point charges representing the remainder of the crystal. The minimum excitation energy of LiF perturbed by the (anti)proton impurity is calculated employing the multiconfiguration self-consistent field method. The repulsive potential of the antiproton causes a dramatic local perturbation of the LiF band structure. We find a strong suppression of the excitation energy by more than an order of magnitude compared to that of the unperturbed crystal. The present results provide a simple explanation of recent stopping-power experiments for antiprotons in LiF which, surprisingly, found a ``metal-like'' behavior of the wide-band-gap insulator LiF. Our results also agree with recent experimental data indicating a deviation from metallic behavior of the stopping power of proton projectiles." @default.
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- W1978045163 date "2009-03-10" @default.
- W1978045163 modified "2023-09-25" @default.
- W1978045163 title "Vanishing gap in LiF for electronic excitations by slow antiprotons" @default.
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- W1978045163 doi "https://doi.org/10.1103/physrevb.79.125107" @default.
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