RELAXATION PHENOMENA IN CLASSICAL AND QUANTUM SYSTEMS

被引:23
|
作者
Spagnolo, B. [1 ,2 ]
Caldara, P. [1 ,2 ]
La Cognata, A. [1 ,2 ]
Augello, G. [1 ,2 ]
Valenti, D. [1 ,2 ]
Fiasconaro, A. [3 ]
Dubkov, A. A. [4 ]
Falci, G. [5 ]
机构
[1] Univ Palermo, Grp Interdisciplinary Phys, Dipartimento Fis, I-90128 Palermo, Italy
[2] CNISM, I-90128 Palermo, Italy
[3] Univ Zaragoza, CSIC, ICMA, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
[4] Nizhnii Novgorod State Univ, Radiophys Dept, Nizhnii Novgorod 603950, Russia
[5] Univ Catania, Dipartimento Fis & Astron, I-95123 Catania, Italy
来源
ACTA PHYSICA POLONICA B | 2012年 / 43卷 / 05期
关键词
NOISE-INDUCED PHENOMENA; RESONANT ACTIVATION; ANOMALOUS DIFFUSION; DYNAMICS; MODEL; ECOSYSTEM;
D O I
10.5506/APhysPolB.43.1169
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Relaxation phenomena in three different classical and quantum systems are investigated. First, the role of multiplicative and additive noise in a classical metastable system is analyzed. The mean lifetime of the metastable state shows a nonmonotonic behavior with a maximum as a function of both the additive and multiplicative noise intensities. In the second system, the simultaneous action of thermal and non-Gaussian noise on the dynamics of an overdamped point Josephson junction is studied. The effect of a Levy noise generated by a Cauchy-Lorentz distribution on the mean lifetime of the superconductive metastable state, in the presence of a periodic driving, is investigated. We find resonant activation and noise enhanced stability in the presence of Levy noise. Finally, the time evolution of a quantum particle moving in a metastable potential and interacting with a thermal reservoir is analyzed. Within the Caldeira-Legget model and the Feynman-Vernon functional approach, we obtain the time evolution of the population distributions in the position eigenstates of the particle, for different values of the thermal bath coupling strength.
引用
收藏
页码:1169 / 1189
页数:21
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