Decoherence and dissipation in a molecular system coupled to anenvironment: An application of semiclassical hybrid dynamics

摘要

Applying the recently developed semiclassical hybrid dynamics [Grossmann, J. Chem. Phys. 125,014111 (2006)], we study the decay of interference patterns in the reduced density as well as of thepurity in a Morse oscillator test system due to the interaction with a finite harmonic bath at zerotemperature. In the case that the bath mimics a continuous Ohmic spectral density, in addition to thequantum classical transition induced by the interaction with the environment, we corroborate theexistence of a blueshift due to the bath coupling, predicted by Pollak [Phys. Rev. A 33, 4244(1986)]. Furthermore, the decoherence dynamics of cat states is confirmed to be faster than that ofsingle coherent states and we show that for a resonant bath the dissipation leads to an increase in thedecoherence rate as compared to the low frequency bath.