Geodesic
State of a conduction electron in a crystal in the case of nonlocal interaction with elementary excitations
Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 1, pp. 91-101 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is shown by means of the electron-exciton interaction that conduction electrons may interact nonlocally with uncharged elementary excitations in a crystal. In the case of such an interaction the carrier state is very different from the polaron state. The carrier energy spectrum is investigated for the case of a nonlocal electron-exciton interaction at $T=0$ for weak and strong electron-exciton coupling. Upper and lower bounds for the ground-state energy of such a quasiparticle (transferon) are found for an arbitrary electron-exciton coupling. 
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È. L. Nagaev. State of a conduction electron in a crystal in the case of nonlocal interaction with elementary excitations. Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 1, pp. 91-101. http://geodesic.mathdoc.fr/item/TMF_1973_14_1_a8/

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