NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2012, 3 (2), P. 73–84
“SUPERRADIANT” PHASE TRANSITION IN THE PRESENCE OF OPTICAL COLLISIONS
I. Yu. Chestnov – Vladimir State University named after A. G. and N. G. Stoletovs, Vladimir, Russia, PhD student, firstname.lastname@example.org
A. P. Alodjants – Vladimir State University named after A. G. and N. G. Stoletovs, Vladimir, Russia, Professor, Doctor of science, email@example.com
S. M. Arakelian – Vladimir State University named after A. G. and N. G. Stoletovs, Vladimir, Russia, Professor, Doctor of science, firstname.lastname@example.org
A problem of high-temperature phase transitions for coupled (dressed) atom-light states and polaritons is considered. An achievement of thermodynamically equilibrium phase for such a states is possible under interaction between rubidium atoms and quantum irradiation in the presence of optical collisions (OCs) with ultra-high pressure buffer gas particles being under
high temperatures (up to 530 K). Special metallic micro-waveguides permitting photon trapping are proposed for purpose of the enhancement of atom-field interaction. A photonic phase transition to the superradiant state, determined by the equilibrium state of coupled system, was theoretically predicted. It have been shown that under large negative atom-light
detunings and certain waveguide parameters photon-like low branch (LB) polaritons undergo high-temperature phase transition to condensate (superfluid) state.
Keywords: optical collisions, phase transitions, dressed states, polaritons.
PACS 42.50.Nn, 05.30.Jp, 32.70.Jz