Article (Scientific journals)
Vanishing gap in LiF for electronic excitations by slow antiprotons
Solleder, Beate; Wirtz, Ludger; Burgdörfer, Joachim
2009In Physical Review. B, 79 (12)
Peer reviewed
 

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Abstract :
[en] 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 F(m)(-)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.
Disciplines :
Physics
Author, co-author :
Solleder, Beate;  Technische Universität Wien = Vienna University of Technology - TU Vienna > Institute for Theoretical Physics
Wirtz, Ludger ;  Centre National de la Recherche Scientifique - CNRS > UMR 8520, Department ISEN > Institute for Electronics, Microelectronics, and Nanotechnology
Burgdörfer, Joachim;  Technische Universität Wien = Vienna University of Technology - TU Vienna > Institute for Theoretical Physics
Language :
English
Title :
Vanishing gap in LiF for electronic excitations by slow antiprotons
Publication date :
2009
Journal title :
Physical Review. B
ISSN :
1098-0121
Volume :
79
Issue :
12
Peer reviewed :
Peer reviewed
Available on ORBilu :
since 12 October 2013

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