  The emergence of travelling sine-Gordon breathers due to the nonlinear
supratransmission effect is theoretically studied in a long Josephson junction
driven by suitable magnetic pulses, taking into account the presence of
dissipation, a current bias, and a thermal noise source. The simulations
clearly indicate that, depending on the pulse's shape and the values of the
main system parameters, such a configuration can effectively yield breather
excitations only. Furthermore, a nonmonotonic behavior of the breather-only
generation probability is observed as a function of the noise intensity.
Finally, the dynamics of the supratransmission-induced breathers is
characterized by looking at quantities such as their radiative decay lifetime
and the medium's energy.

Mesoscale and Nanoscale Physics;Statistical Mechanics