Effects of Low Energy Excitations in SNS Junction on the Dynamics of Josephson Phase
Effects of Low Energy Excitations in SNS Junction on the Dynamics of Josephson Phase
复制标题
SNS结低能激发对约瑟夫森相动力学的影响
DOI：
10.1143/jpsj.66.2820
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发表时间：
1997
影响因子：
1.7
通讯作者：
H. Fukuyama
中科院分区：
文献类型：
--
作者：
Kaoru Awaka;H. Fukuyama
研究了低能激发对 SNS 结约瑟夫森相动力学的影响。从微观哈密顿量中，导出了相位变量的有效作用。正常 (N) 区域中低能量激发引起的延迟效应在相动力学中发挥着重要作用。通过自洽调和近似，计算了质量重正化和耗散常数，总体上揭示了前者的增强和后者的抑制。根据这些重整化值，会出现各种情况。
Effects of low energy excitation on the dynamics of Josephson phase in SNS junction are investigated. From the microscopic Hamiltonian, the effective action for the phase variable is derived. The retardation effects due to low energy excitation in normal (N) region are seen to play important roles in the dynamics of the phase. By the self-consistent harmonic approximation, renormalization of mass and dissipation constant are calculated, revealing the enhancement of the former and the suppression of the latter in general. Various situation appears depending on these renormalized values.