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Investigation of Noise-Induced Escape Rate: A Quantum Mechanical Approach

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Abstract

A quantum system coupled to a heat-bath in non-equilibrium environment is considered to study the problem of noise-induced escape rate from a metastable state in the moderate to strong friction limit (Kramers’ regime). It is known that starting from an initial coherent state representation of bath oscillators, one can derive a c-number generalized quantum Langevin equation where the quantum correction terms appear as a coupled infinite set of hierarchy of equations. For practical purpose, one should truncate these equations after a certain order. In our present development, we calculate the quantum correction terms in a closed analytical form based on a systematic perturbation technique and then derive the lowest order quantum correction factor exactly in the case of an Ohmic dissipative bath. Finally, to demonstrate its applicability, the effective equation of motions has been used to study the barrier crossing dynamics which incorporates the quantum correction factors.

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Authors and Affiliations

  1. Department of Chemistry, Bengal Engineering and Science University, Shibpur, Howrah, 711103, India

    Satyabrata Bhattacharya & Sudip Chattopadhyay

  2. Department of Physics, Katwa College, Katwa, Burdwan, 713130, India

    Jyotipratim Ray Chaudhuri

Authors
  1. Satyabrata Bhattacharya
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  2. Sudip Chattopadhyay
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  3. Jyotipratim Ray Chaudhuri
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Corresponding authors

Correspondence to Sudip Chattopadhyay or Jyotipratim Ray Chaudhuri.

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Bhattacharya, S., Chattopadhyay, S. & Ray Chaudhuri, J. Investigation of Noise-Induced Escape Rate: A Quantum Mechanical Approach. J Stat Phys 136, 733–750 (2009). https://doi.org/10.1007/s10955-009-9802-5

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  • DOI: https://doi.org/10.1007/s10955-009-9802-5

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