Tuesday, May 7, 2013

1305.1210 (Yurii Slyusarenko et al.)

Bose condensate of photons in dilute nondegenerated atomic gas    [PDF]

Yurii Slyusarenko, Alex Kruchkov
We considered peculiarities of Bose-Einstein condensation of photons that are in thermodynamic equilibrium with atoms of diluted gases. General equations of the thermodynamic equilibrium of the system under study were obtained. Solutions of these equations in the case of high temperatures, when the atomic components of the system can be considered as nondegenerated ideal gases of atoms, and photonic component can form a state with Bose condensate, were studied. Transcendental equation for transition temperature and expression for the density of condensed photons in considered system were derived. Analytical solutions of the equation for the critical temperature in a number of particular cases were considered. The existence of two regimes of Bose condensation of photons, which differ significantly in nature of transition temperature dependence on the total density of pumped into the system photons, was revealed. In one case, this dependence is a traditional fractional-power law, and in another one it is the logarithmic law. Applying numerical methods, boundaries of existence and condensate implementation conditions were determined for both regimes, depending on the physical parameters of the system under study. We also showed, that for a large range of physical systems that are in equilibrium with photons (from ultracold gases of alkali metals to certain types of ideal plasma), the condensation of photons should occur according to the logarithmic regime.
View original: http://arxiv.org/abs/1305.1210

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