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物理学报. 2007, 56(4): 1919-1923.
doi: 10.7498/aps.56.1919.
非线性耗散对亚稳态系统量子衰变速率的影响
- 收稿日期: 2006-06-01
- 修回日期: 2006-11-20
- 刊出日期: 2007-02-05
English Abstract
Influence of nonlinear coupling on quantum decay rate of metastable dissipative systems
- Received Date:
01 June 2006
- Accepted Date:
20 November 2006
- Published Online:
05 February 2007
Abstract: We develop the fast-Fourier-transformation path-integral approach to investigate the quantum decay of a nonlinear dissipative system. The action of the bounce trajectory, i.e. the exponential factor of decay rate, is obtained. In the case of the nonlinear coupling f(x)=tanh［λ(x-xb)］ between the system and its environment, we find that the nonlinear coupling suppresses the decay rate. In contrast to the usual linear coupling, the action will not abide by the law SB=a［1-b(T/Tc)2］ and the crossover temperature rebounds, which means that the system steps into the quantum tunneling region at a higher temperature.
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