Dynamical mechanisms leading to equilibration in two-component gases
  Demonstrating how microscopic dynamics cause large systems to approach thermal equilibrium remains an elusive, longstanding, and actively-pursued goal of statistical mechanics. We identify here a dynamical mechanism for thermalization in a general class of two-component dynamical Lorentz gases, and prove that each component, even when maintained in a non-equilibrium state itself, can drive the other to a thermal state with a well-defined effective temperature. 
Stephan De Bi\`evre, Carlos Mej\'ia-Monasterio, Paul E. Parris
cond-mat.stat-mech