| Autor: |
Kónya, Gábor, Nagy, Dávid, Szirmai, Gergely, Domokos, Peter |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
Phys. Rev. A 98, 063608 (2018) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevA.98.063608 |
| Popis: |
We study quasiparticle scattering effects on the dynamics of a homogeneous Bose-Einstein condensate of ultracold atoms coupled to a single mode of an optical cavity. The relevant excitations, which are polariton-like mixed excitations of photonic and atomic density-wave modes, are identified. All the first-order correlation functions are presented by means of the Keldysh Green's function technique. Beyond confirming the existence of the resonant enhancement of Beliaev damping, we find a very structured spectrum of fluctuations. There is a spectral hole burning at half of the recoil frequency reflecting the singularity of the Beliaev scattering process. The effects of the photon-loss dissipation channel and that of the Beliaev damping due to atom-atom collisions can be well separated. We show that the Beliaev process does not influence the properties of the self-organization criticality. |
| Databáze: |
arXiv |
| Externí odkaz: |
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