Quantum dynamics of system strongly coupled to low-temperature colored noise bath: Reduced hierarchy equations approach
Quantum dynamics of system strongly coupled to low-temperature colored noise bath: Reduced hierarchy equations approach
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DOI：
10.1143/jpsj.74.3131
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发表时间：
2005-12-01
影响因子：
1.7
通讯作者：
Tanimura, Y
中科院分区：
文献类型：
--
作者：
Ishizaki, A;Tanimura, Y
通过推广TAnimura和Kubo提出的二能级系统的简化运动方程[J.Phys]，建立了与谐振子池强耦合的二能级系统的简化运动方程。SoC。日本。58(1989)101]。该方程组以非微扰的方式处理熔池，并且考虑了噪声的关联时间，适用于低温系统。通过对不同温度下的线性吸收光谱的数值计算，证明了本理论不存在没有旋波近似的低温下的动力学正性问题。当温度低于二能级系统的共振能时，光谱发生了显著的变化。
Reduced equations of motion for a two-level system strongly coupled to a harmonic oscillators bath are constructed by extending the hierarchy of equations introduced by Tanimura and Kubo [J. Phys. Soc. Jpn. 58 (1989) 101]. The set of equations treats the bath in a nonperturbative manner and is applicable to a low-temperature system with taking into account the correlation time of noise. By numerically calculating linear absorption spectra for different temperatures, we demonstrate that the present theory is not afflicted with the dynamical positivity problem that Occurs at low temperatures without the rotating wave approximation. Remarkable changes are found in the spectra when the temperature is lower than the resonant energy of the two-level system.