Abstract
Band narrowing and band shifts due to excitonic-polaron formation are considered for an electronically polarizable medium. Experimental evidence of such effects in molecular crystals is cited. The central result is that the electron-exciton interaction in the strong-coupling regime leads not only to an indirect attractive electron-electron interaction, but also because of small-polaron formation leads to severe band narrowing. This band narrowing tends to favor the insulating state. The implications of the excitonic polaron for the metal-insulator transition, organic semiconductors, and the question of the possible existence of superconductivity in organic molecular crystals are discussed.
Original language | English (US) |
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Pages (from-to) | 4966-4969 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 5 |
Issue number | 12 |
DOIs | |
State | Published - 1972 |
ASJC Scopus subject areas
- Condensed Matter Physics