Quantum Vibrational Impurity Embedded in a One-dimensional Chain

Details Quantum Vibrational Impurity Embedded in a One-dimensional Chain Quantum Vibrational Impurity Embedded in a One-dimensional Chain

1997-04-08

arxiv.org/abs/cond-mat/9704069v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages, 4 figures

Scientific paper

10.1016/S0375-9601(97)00539-2

We perform a fully quantum mechanical numerical calculation for the problem of a single electron (or excitation) propagating in a N-site one-dimensional chain in the presence of a single Holstein impurity. We compute the long-time averaged probability for finding the electron on the impurity site as a function of the nonlinearity parameter, defined in terms of the electron-phonon coupling strength and the oscillator frequency. The results, in the intermediate nonlinearity parameter range, differ substantially from the ones obtained through the use of the discrete nonlinear Schroedinger equation, even in the high-frequency regime.

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