Volume 133, Number 3, February 2021
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||26 March 2021|
Quantum degeneracy and phase-space density in superradiant semiconductor heterostructures at room temperature
1 Centre for Photonic Systems, University of Cambridge - 9 JJ Thomson Avenue, Cambridge, CB3 0FA UK
2 Quantum Radiophysics Department, PN Lebedev Physical Institute - 53 Leninsky Prospect, Moscow 119991, Russia
Received: 15 August 2020
Accepted: 6 January 2021
We investigate the fulfilment of the quantum degeneracy criterium in bulk GaAs/AlGaAs heterostructures operated under the superradiant emission generation at room temperature. The e-h density has been evaluated by analysing both spontaneous window emission from above the samples and amplified spontaneous emission radiated from their edges. The maximum experimental value of the phase-space density is 1.31 at . It is supposed that resonant photons with energies at the band gap establish coherence within the e-h ensemble and facilitate the build-up of a macroscopic wave packet from overlapped wave functions of collectively paired electrons and holes. As a result, the photon-mediated “stimulated” condensation of e-h pairs in phase space can take place at room temperature.
PACS: 71.35.Lk – Collective effects (Bose effects, phase space filling, and excitonic phase transitions) / 42.50.Nn – Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems / 67.85.Jk – Other Bose-Einstein condensation phenomena
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