Two-Dimensional Triplet Magnetoexcitons and a Magnetofermionic Condensate in the GaAs/AlGaAs Heterostructures

A fundamentally new collective state, namely, the magnetofermionic condensate, is discovered during photoexcitation of a sufficiently dense gas of long-lived triplet cyclotron magnetoexcitons in a twodimensional Hall insulator with a high electron mobility, a filling factor of ν = 2, and temperature...

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Bibliographic Details
Published in:Physics of the solid state 2018-08, Vol.60 (8), p.1645-1652
Main Authors: Kulik, L. V., Gorbunov, A. V., Zhuravlev, A. S., Timofeev, V. B., Kukushkin, I. V.
Format: Article
Language:English
Subjects:
ALUMINIUM ARSENIDES
BOSE-EINSTEIN STATISTICS
CONDENSATES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Cyclotrons
ELECTROMAGNETIC FIELDS
Electromagnetism
ELECTRON GAS
ELECTRON MOBILITY
Electron recombination
Electrons
ENERGY SPECTRA
Fermions
Gallium arsenide
GALLIUM ARSENIDES
Heterostructures
LAYERS
Low-Dimensional Systems
Photoexcitation
Physics
Physics and Astronomy
RECOMBINATION
Solid State Physics
SPIN
TEMPERATURE RANGE 0000-0013 K
TWO-DIMENSIONAL SYSTEMS
VALENCE
Valence band
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Summary:A fundamentally new collective state, namely, the magnetofermionic condensate, is discovered during photoexcitation of a sufficiently dense gas of long-lived triplet cyclotron magnetoexcitons in a twodimensional Hall insulator with a high electron mobility, a filling factor of ν = 2, and temperatures of T < 1 K. The condensed phase coherently interacts with an external electromagnetic field, exhibits superradiant properties in the recombination of correlated condensate electrons with heavy holes in the valence band, and spreads nondissipatively in the layer of a two-dimensional electron gas to macroscopical large distances, transferring an integer spin. The observed effects are explained in terms of a coherent condensate in a nonequilibrium system of two-dimensional fermions with a fully quantized energy spectrum, in which a degenerate ensemble of long-lived triplet magnetoexcitons obeying the Bose statistics is present.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783418080152