Fig. 5: Post-pulse dynamics of individual momentum harmonics.
From: Periodic dynamics in superconductors induced by an impulsive optical quench
a Evolution of δn(q, t) = n(q, t) − neq(q), where n(q, t) = 〈E(−q, t) ⋅ E(q, t)〉, illustrates that the entire plasmon continuum gets excited. Low momenta modes are affected more strongly compared to large momenta ones. b Dynamics of δn(q, t) at q = 0 displays the bi-plasmon periodic dynamics. For typical model parameters, the relative amplitude of oscillating fluctuations can be ~100% of the thermal equilibrium fluctuations neq(0). Remarkably, during these oscillations, the thermal noise can be reduced by ~40% at the bottom of the first cycle, which is clear evidence for the vacuum squeezing. Parameters are the same as in Fig. 3c.
