Pumped Dirac Materials

Recent pump-probe experiments demonstrate the possibility that Dirac materials may be driven
into transient excited states describable by two chemical potentials, one for the electrons and one
for the holes. Given the Dirac nature of the spectrum, such an inverted population allows the
optical tunability of the density of states of the electrons and holes, effectively offering control of the
strength of the Coulomb interaction. In a recent preprint we discuss the feasibility of realizing transient excitonic instabilities in optically-pumped Dirac materials. We have demonstrated, theoretically, the reduction of the critical coupling leading to the formation of a transient condensate of electron-hole pairs and identify signatures of this state.

  1. https://arxiv.org/abs/1701.04206