Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-8672
Hamm, P; Tsironis, G P (2008). Barrier crossing to the small Holstein polaron regime. Physical Review B, 78(9):092301.
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We investigate the dimensionality effects of the Holstein polaron from the fully quantum regime, where the crossover between large and small polaron solutions is known to be continuous in all dimensions, into the limit described by the semiclassical discrete nonlinear Schrodinger (DNLS) equation, where the crossover is continuous in one dimension (1D) but discontinuous in higher dimensions. We use exact numerics on one hand and a two variable parametrization of the Toyozawa ansatz on the other in order to probe the crossover region in all parameter regimes. We find that a barrier appears also in 1D separating the two types of solutions, seemingly in contradiction to the common paradigm for the DNLS according to which the crossover is barrier-free. We quantify the polaron behavior in the crossover region as a function of the exciton overlap and find that the barrier remains small in 1D and tunneling through it is not rate-limiting.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Department of Chemistry|
|Deposited On:||14 Jan 2009 16:06|
|Last Modified:||05 Jun 2014 13:50|
|Publisher:||American Physical Society|
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