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

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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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     author = {\`E. L. Nagaev},
     title = {State of a conduction electron in a crystal in the case of nonlocal interaction with elementary excitations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {91--101},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_14_1_a8/}
}
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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/