Journal
CHEMICAL PHYSICS LETTERS
Volume 360, Issue 5-6, Pages 487-493Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(02)00832-1
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We show, by electronic structure based molecular dynamics simulations, that an extra electron injected in crystalline polyethylene should fall spontaneously into a self-trapped state, a shallow donor with a large novel distortion pattern involving a pair of trans-gauche defects. Parallel calculations show instead that a hole will remain free and delocalized. We trace the difference of behavior to the intrachain nature of the hole, as opposed to the interchain one of the electron, and argue that applicability of this concept could be more general. Thus electrons (but not holes) should tend to self-trap in saturated organic insulators, but not for example in aromatic insulators, where both carriers are intrachain. (C) 2002 Elsevier Science B.V. All rights reserved.
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