Excitons and biexcitons in symmetric electron-hole bilayers

Ryo Maezono, Pablo López Ríos, Tetsuo Ogawa, and Richard J. Needs
Phys. Rev. Lett. 110, 216407 – Published 23 May 2013
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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 rs and layer separations d. At small d 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 d=0, excitons appear to survive down to about rs=0.5a.u., and biexcitons form at rs>2.5a.u.

  • Received 28 January 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.216407

© 2013 American Physical Society

Authors & Affiliations

Ryo Maezono

  • School of Information Science, JAIST, Asahidai 1-1, Nomi, Ishikawa, 923-1292, Japan

Pablo López Ríos*

  • Theory of Condensed Matter Group, Cavendish Laboratory, J. J Thomson Avenue, Cambridge CB3 0HE, United Kingdom

Tetsuo Ogawa

  • Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan

Richard J. Needs

  • Theory of Condensed Matter Group, Cavendish Laboratory, J. J Thomson Avenue, Cambridge CB3 0HE, United Kingdom

  • *pl275@cam.ac.uk

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Issue

Vol. 110, Iss. 21 — 24 May 2013

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