Dipole-dipole interactions inside electron-hole plasma

We numerically investigate the effects of electron-hole plasma on excitonic states as well as its effects on dipole-dipole interactions between coupled exitons. In our model, we treat the dipole as a fixed central positive charge and a harmonically trapped negative charge oscillating around it in an eigenstate of a harmonic oscillator or a superposition of multiple eigenstates. We numerically evolve the electron and hole constituents of the plasma through classical electric interactions with each other and with the dipole charges. However, we follow the state of the oscillating dipole by tracking the change of its quantum Wigner function and its projection on the different eigenstates of the harmonic oscillator eigenstates. Our analysis shows that, through the interaction with the plasma particles, the quantum Wigner distribution of the dipole turns into a classical phase space distribution without any negative regions on the phase space. We also investigate the dipole-dipole interactions between two such dipoles and the effect of the plasma on the transfer of energy between them.