TY - JOUR JF - opsi JO - ICOP & ICPET _ INPC _ ICOFS VL - 25 IS - 0 PY - 2019 Y1 - 2019/3/01 TI - Optical Phase Transition in Janes-Cummings Model with Counter Rotating Wave TT - گذار فاز اپتیکی در مدل جینز- کامینگز با موج پاد چرخان N2 - In this paper it is shown that there is an optical phase transition in the systems of two level atoms and photons, with large detuning and under counter-rotating wave approximation. Our calculations show that such system, even under this approximation have two independent optical phases, the well known normal and super-radiant ones. In the normal phase, the ground state of the total Hamiltonian, with a large detuning, is a state for which the mean photon number is zero. On the other hand, when the atom-photon coupling constant exceeds a critical value, the photon mean number is nonzero when the system is in the ground state, and the system makes a transition to the super-radiant phase. We also show this is a second order phase transition. SP - 857 EP - 860 AU - Samimi, Saheb AU - Golshan, Mohammad mahdi AD - Physics Department, Science College, Shiraz University, Shiraz, Iran KW - Counter Rotating Wave KW - Quantum Optics KW - Phase transition KW - Super Radiant UR - http://opsi.ir/article-1-1673-en.html ER -