Long-range order in a high-density electron-hole system at room temperature during superradiant phase transition
1 Centre for Photonics Systems, Department of Engineering, University of Cambridge - 9 JJ Thomson Avenue, Cambridge, CB3 0FA, UK
2 PN Lebedev Physical Institute - 53 Leninsky Prospect, Moscow 119991, Russia
Received: 21 October 2013
Accepted: 24 November 2013
We have experimentally investigated the formation of off-diagonal long-range order and non-equilibrium BEC-like condensation in GaAs/AlGaAs heterostructures during superradiant (SR) emission at room temperature. The conclusive evidence of the establishment of phase coherence over a macroscopic range during the superradiant quantum phase transition is reported. The first-order spatial correlation function of the e-h system is determined by evaluating interference patterns of SR emission using Young's double slit.
PACS: 05.70.Fh – Phase transitions: general studies / 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 42.50.Nn – Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems
© EPLA, 2013