Energetic comparison of exciton gas versus electron-hole plasma in a bilayer two-dimensional electron-hole system
The study compares two states of a symmetric electron-hole bilayer: an electron-hole plasma and an exciton gas, using zero-temperature ground state energies. It found that excitons are stable at small layer separation. However, the results show that the outcome depends heavily on the approximation used for screening, indicating that energetic comparisons are sensitive to theoretical treatment.