Thermalization and Transport in Dense Ensembles of Triplet Magnetoexcitons

In a dilute gas of triplet magnetoexcitons, complete thermalization does not occur because the energy and momentum cannot be conserved simultaneously. Relaxation to the lowest energy state becomes possible owing to exciton—exciton scattering upon reaching a certain critical exciton density. Since th...

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Bibliographic Details
Published in:JETP letters 2019-08, Vol.110 (4), p.284-289
Main Authors: Zhuravlev, A. S., Kuznetsov, V. A., Gorbunov, A. V., Kulik, L. V., Timofeev, V. B., Kukushkin, I. V.
Format: Article
Language:English
Subjects:
Atomic
Biological and Medical Physics
Biophysics
Condensates
Condensed Matter
Density
Excitons
Molecular
Momentum
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Solid State Physics
Spintronics
Thermalization (energy absorption)
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Summary:In a dilute gas of triplet magnetoexcitons, complete thermalization does not occur because the energy and momentum cannot be conserved simultaneously. Relaxation to the lowest energy state becomes possible owing to exciton—exciton scattering upon reaching a certain critical exciton density. Since thermalization times are extremely large, ensembles of magnetoexcitons are substantially nonequilibrium and consist of above-condensate magnetoexcitons with generalized momenta close to zero and magnetoexcitons at the energy minimum with momenta about the inverse magnetic length. It has been shown experimentally that the magnetoexciton density is transferred to long distances not by all magnetoexcitons, but by those whose momentum is close to the inverse magnetic length, ∼10 6 cm −1 , and these magnetoexcitons form a magnetofermionic condensate.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364019160136