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Phase separation kinetics of two-temperature induced phase transition at low density: Cluster growth by ballistic
Nayana Venkatareddy1, Partha Sarathi Mondal2, Shradha Mishra2
1Indian Institute of Science, Department of Physics, C. V. Raman Avenue, Bengaluru, Karnataka 560012, India.
Abstract:
We study the kinetics of two-temperature induced phase separation in dilute binary mixtures of active ("hot") and passive ("cold") particles using molecular dynamics simulations and a coarse-grained hydrodynamic model. Following a temperature quench, cold particles nucleate into mobile clusters that move ballistically and merge through successive coalescence events. The resulting domain growth exhibits dynamic scaling with a growth exponent ≈0.7, markedly faster than diffusive coarsening. We identify this regime as ballistic agglomeration of cold clusters, demonstrating a distinct nonequilibrium growth mechanism in low-density scalar active systems.
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