Non-Equilibrium Green's Function Approach to Dielectric Response: De-Screening ofthe Coulomb Interaction at High Electric Fields

摘要

High-field dielectric response is investigated using the technique of non-equilibrium Green's functions based on an Airy-coordinate formulation. The field-dependent polarization function of the system is derived. De-screening of the Coulomb interaction due to collisional broadening and high electric field is examined.