Anisotropic terahertz response from a strong-field ionized electron-ion plasma

摘要

Amicroscopic theory is adapted to compute the time-resolved terahertz (THz) probe response of a dynamicallynevolving, strong-field ionized electron-ion plasma. The numerical solutions show that the relaxation of theninitially highly anisotropic carrier distributions leads to a polarization dependent short-time THz response. ThisnTHz polarization discrimination gradually vanishes as the plasma approaches a thermodynamic equilibriumnconfiguration via electron-electron and electron-ion scattering. The detailed carrier-relaxation dynamics causesna strongly nonmonotonic time-development of the THz absorption.