Directed motion in a periodic potential of a quantum system coupled to a heat bath driven by a colored noise.
A system-reservoir nonlinear coupling model is proposed for a quantum system when the associated bath is not in thermal equilibrium but is modulated by an external colored noise, to present a microscopic approach to quantum state-dependent diffusion and multiplicative noise in terms of a quantum Langevin description. Consequently, the Fokker-Planck equation in position space, valid in the overdamped limit, for multiplicative colored noise is constructed to explore the possibility of observing a quantum current and dependence of the current on various parameters of external noise is examined.
Department of Chemistry, Bengal Engineering and Science University, Shibpur, Howrah 711103, India.
Satyabrata
S
Bhattacharya
Pinaki
P
Chaudhury
Sudip
S
Chattopadhyay
Jyotipratim Ray
JR
Chaudhuri