Excitonic condensation in a symmetric electron-hole bilayer

Details Excitonic condensation in a symmetric electron-hole bilayer Excitonic condensation in a symmetric electron-hole bilayer

2002-01-23

arxiv.org/abs/cond-mat/0201414v1

Phys. Rev. Lett. 88, 206401 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, 2 tables

Scientific paper

10.1103/PhysRevLett.88.206401

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 in-layer electronic correlation. This stabilizes the electron-hole plasma at large values of the density or inter-layer 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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