Excitonic condensation in a symmetric electron-hole bilayer.
Using diffusion Monte Carlo simulations we have investigated the ground state of a symmetric electron-hole bilayer and determined its phase diagram at T = 0. We find clear evidence of an excitonic condensate, whose stability however is affected by an in-layer electronic correlation. This stabilizes the electron-hole plasma at large values of the density or interlayer distance, and the Wigner crystal at low density and large distance. We have also estimated pair correlation functions and low-order density matrices to give a microscopic characterization of correlations as well as to try and estimate the condensate fraction.
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INFM-Istituto Nazionale di Fisica della Materia, Unità di Trieste, Strada Costiera 11, 34014 Trieste, Italy.
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Senatore
Gaetano
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