Synchronization crossover of polariton condensates in weakly disordered lattices

H. Ohadi, Y. del Valle-Inclan Redondo, A. J. Ramsay, Z. Hatzopoulos, T. C. H. Liew, P. R. Eastham, P. G. Savvidis, and J. J. Baumberg
Phys. Rev. B 97, 195109 – Published 8 May 2018
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Abstract

We demonstrate that the synchronization of a lattice of solid-state condensates when intersite tunneling is switched on depends strongly on the weak local disorder. This finding is vital for implementation of condensate arrays as computation devices. The condensates here are nonlinear bosonic fluids of exciton-polaritons trapped in a weakly disordered Bose-Hubbard potential, where the nearest-neighboring tunneling rate (Josephson coupling) can be dynamically tuned. The system can thus be tuned from a localized to a delocalized fluid as the number density or the Josephson coupling between nearest neighbors increases. The localized fluid is observed as a lattice of unsynchronized condensates emitting at different energies set by the disorder potential. In the delocalized phase, the condensates synchronize and long-range order appears, evidenced by narrowing of momentum and energy distributions, new diffraction peaks in momentum space, and spatial coherence between condensates. Our paper identifies similarities and differences of this nonequilibrium crossover to the traditional Bose-glass to superfluid transition in atomic condensates.

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  • Received 27 February 2018

DOI:https://doi.org/10.1103/PhysRevB.97.195109

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsNonlinear Dynamics

Authors & Affiliations

H. Ohadi1,2,*, Y. del Valle-Inclan Redondo1, A. J. Ramsay3, Z. Hatzopoulos4, T. C. H. Liew5, P. R. Eastham6, P. G. Savvidis4,7,8, and J. J. Baumberg1,†

  • 1Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
  • 2SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, United Kingdom
  • 3Hitachi Cambridge Laboratory, Hitachi Europe Ltd., Cambridge CB3 0HE, United kingdom
  • 4FORTH, Institute of Electronic Structure and Laser, 71110 Heraklion, Crete, Greece
  • 5School of Physical and Mathematical Sciences, Nanyang Technological University 637371, Singapore
  • 6School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
  • 7ITMO University, St. Petersburg 197101, Russia
  • 8Department of Materials Science and Technology, University of Crete, 71003 Heraklion, Crete, Greece

  • *ho35@st-andrews.ac.uk
  • jjb12@cam.ac.uk

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Issue

Vol. 97, Iss. 19 — 15 May 2018

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