539 / 2019-03-20 01:36:50

Extremely low electron-ion temperature relaxation rates in warm dense hydrogen: Interplay between quantum electrons and coupled ions

temperature relaxation, electron force field, warm dense hydrogen

全体主题 > Fundamental Physics at Extremes

Collisions are theoretically pivotal and challenging for the non-equilibrium processes in warm dense matter. Here, the electron-ion relaxation in warm dense hydrogen is
investigated by molecular dynamics (MD) simulation with Electron Force Field method (eFF). Quantum collisions are therefore included since the electrons are treated as Gaussian wave packets, and the Coulomb Catastrophe in classical MD can be avoided. The results of eFF show that the temperature relaxation time can be up to 4.1 times longer than that from current popular models and classical MD. The analyses of particle distributions, kinetic and potential energies, mean free path show that quantum
degeneracy, delocalization, and cross sections of electrons with coupled ions are the intrinsic physics for the extremely low energy exchange rates in large-angle collisions dominated warm dense matter.