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Composite boson description of a low-density gas of excitons

Author
Golomedov, A.; Lozovik, Y.; Astrakharchik, G.; Boronat, J.
Type of activity
Journal article
Journal
Journal of low temperature physics
Date of publication
2017-10-13
Volume
189
Number
5-6
First page
300
Last page
311
DOI
https://doi.org/10.1007/s10909-017-1814-y Open in new window
Repository
http://hdl.handle.net/2117/110068 Open in new window
URL
https://link.springer.com/article/10.1007%2Fs10909-017-1814-y Open in new window
Abstract
Ground-state properties of a fermionic Coulomb gas are calculated using the fixed-node diffusion Monte Carlo method. The validity of the composite boson description is tested for different densities. We extract the exciton–exciton s-wave scattering length by solving the four-body problem in a harmonic trap and mapping the energy to that of two trapped bosons. The equation of state is consistent with the Bogoliubov theory for composite bosons interacting with the obtained s-wave scattering leng...
Citation
Golomedov, A., Lozovik, Y., Astrakharchik, G., Boronat, J. Composite boson description of a low-density gas of excitons. "Journal of low temperature physics", 13 Octubre 2017, vol. 189, núm. 5-6, p. 300-311.
Keywords
Bose–Einstein condensation, Composite bosons, Excitons, Quantum Monte Carlo
Group of research
SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity

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