Fluctuation-driven structure reorganization and fast growth in phase-separating mixtures at low temperature

We investigate the phase-separation kinetics of deep-quenched binary mixtures in the presence of external fluctuations. In deep quenches, domains form sharp $〈1 0〉$ interfaces and evaporation-condensation mechanism is suppressed, leading to a sluggish domain growth. With the inclusion of external fluctuations, however, domains with diagonal-oriented interfaces become preferable due to the instability of horizontal and vertical interfaces. Moreover, external fluctuations enhance the phase separation. For a given small frequency of the external perturbation, the atom diffusion across the interfaces will predominate when fluctuation-induced exchange strengths are strong, leading to a full recovery of the evaporation-condensation mechanism.