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Synchronization crossover of polariton condensates in weakly disordered lattices

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Redondo, Y del Valle-Inclan 
Ramsay, AJ 
Hatzopoulos, Z 
Liew, TCH 

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.

Description

Keywords

cond-mat.other, cond-mat.other

Journal Title

Physical Review B - Condensed Matter and Materials Physics

Conference Name

Journal ISSN

2469-9950
2469-9969

Volume Title

97

Publisher

American Physical Society
Sponsorship
European Research Council (320503)
Engineering and Physical Sciences Research Council (EP/L027151/1)