title: Spectrum of an oscillator with jumping frequency and the interference of partial susceptibilities.
abstract: We study an underdamped oscillator with random frequency jumps. We describe the oscillator spectrum in terms of coupled susceptibilities for different-frequency states. Depending on the parameters, the spectrum has a fine structure or displays a single asymmetric peak. For nanomechanical resonators with a fluctuating number of attached molecules, it is found in a simple analytical form. The results bear on dephasing in various types of systems with jumping frequency.
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: M I
authors.initials: MI
authors.lastname: Dykman
authors.forename: M
authors.initials: M
authors.lastname: Khasin
authors.forename: J
authors.initials: J
authors.lastname: Portman
authors.forename: S W
authors.initials: SW
authors.lastname: Shaw