Abstract Parametric oscillation occurs when the resonance frequency of an oscillator is periodically modulated. Owing to time-reversal symmetry breaking in magnets, nonreciprocal magnons can be parametrically excited spatial-inversion provided. This means that with opposite propagation directions have different amplitudes. Here we demonstrate switching on and off magnon parametric by reversing ...

Optical parametric oscillators are one of the building pillars nonlinear and quantum optics, basis minimum-uncertainty states entangled photon pairs. Transferring similar ideas to mechanical vibrations, authors demonstrate an optomechanical oscillator based on a lattice traps that confine couple fluids light sound. Nonresonant continuous laser excitation leads 20 GHz self-induced oscillations p...

The time evolution of quantum meson fields in the O(4) linear sigma model is investigated in a context of the dynamical chiral phase transition. It is shown that amplitudes of quantum pion modes are amplified due to both mechanisms of a parametric resonance and a resonance by the forced oscillation according to the small oscillation of the chiral condensate in the late time of chiral phase tran...