Effects of barrier fluctuation on the tunneling dynamics in the presence of classical chaos in a mixed quantum-classical system |
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Authors: | Aparna Saha Bidhan Chandra Bag Pranab Sarkar |
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Institution: | (1) Department of Chemistry, Visva-Bharati University, Santiniketan, 731 235, India |
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Abstract: | We present a numerical investigation of the tunneling dynamics of a particle moving in a bistable potential with fluctuating
barrier which is coupled to a non-integrable classical system and study the interplay between classical chaos and barrier
fluctuation in the tunneling dynamics. We found that the coupling of the quantum system with the classical subsystem decreases
the tunneling rate irrespective of whether the classical subsystem is regular or chaotic and also irrespective of the fact
that whether the barrier fluctuates or not. Presence of classical chaos always enhances the tunneling rate constant. The effect
of barrier fluctuation on the tunneling rate in a mixed quantum-classical system is to suppress the tunneling rate. In contrast
to the case of regular subsystem, the suppression arising due to barrier fluctuation is more visible when the subsystem is
chaotic.
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Keywords: | Fluctuating barrier classical chaos tunneling dynamics |
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