Quantum theory of dissipation of a harmonic oscillator coupled to a non-equilibrium bath; Wigner-Weisskopf decay and physical spectra

Jyotipratim Ray Chaudhuri, Bimalendu Deb, Gautam Gangopadhyay, Deb Shankar Ray
1998 Journal of Physics B: Atomic, Molecular and Optical Physics  
We extend the quantum theory of dissipation in the context of system-reservoir model, where the reservoir in question is kept in a nonequilibrium condition. Based on a systematic separation of time scales involved in the dynamics, appropriate generalizations of the fluctuation-dissipation and Einstein's relations have been pointed out. We show that the Wigner-Weisskopf decay of the system mode results in a rate constant which depending on the relaxation of nonequilibrium bath is dynamically
more » ... is dynamically modified. We also calculate the time-dependent spectra of a cavity mode with a suitable gain when the cavity is kept in contact with a nonequilibrium bath.
doi:10.1088/0953-4075/31/17/011 fatcat:kzfa3g6uhraxhnnbsvqjihwtpm