Motional narrowing effect in one-dimensional Frenkel chains with configurational disorder

Details Motional narrowing effect in one-dimensional Frenkel chains with configurational disorder Motional narrowing effect in one-dimensional Frenkel chains with configurational disorder

1999-08-30

arxiv.org/abs/cond-mat/9908437v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

13 pages, REVTeX, to appear in Chemical Physics Letters

Scientific paper

10.1016/S0009-2614(99)01025-8

We analyze the peculiarities of the motional narrowing effect in disordered one-dimensional Frenkel chains with off-diagonal disorder, induced by uncorrelated Gaussian fluctuations in the positions of the host units. A clear difference in the scaling laws with respect to the magnitude of the positional disorder and the chain size is found, as compared to those for uncorrelated diagonal disorder as well as for off-diagonal disorder modeled by uncorrelated randomness in the nearest-neighbor couplings. The origin of such a difference is discussed in detail.

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