Abstract
Symmetric electron-hole bilayer systems have been studied at zero temperature using the diffusion quantum Monte Carlo method. A flexible trial wave function is used that can describe fluid, excitonic, and biexcitonic phases. We calculate condensate fractions and pair correlation functions for a large number of densities and layer separations . At small we find a one-component fluid phase, an excitonic fluid phase, and a biexcitonic fluid phase, and the transitions among them appear to be continuous. At , excitons appear to survive down to about , and biexcitons form at
- Received 28 January 2013
DOI:https://doi.org/10.1103/PhysRevLett.110.216407
© 2013 American Physical Society