Quantum effect in a generalized N-atom Dicke model

Horacio Grinberg

吉睿 JI Rui, 刘妮 LIU Ni, 梁九卿 LIANG Jiu-qing

Andrew I. Trubilko, Ashat M. Basharov

Delay of a superradiance pulse of an ensemble of identical atoms in a half-excited state has been detected. No such delay has been detected for an ensemble of fully excited atoms. These effects are due to the nonresonant interaction of a localized atomic ensemble with vacuum broadband environment, which is disregarded within the traditional Dicke model but is taken into account within the generalized Dicke model.

Yong Li, Z. D. Wang, C. P. Sun

We employ a generalized Dicke model to study theoretically the quantum criticality of an extended two-level atomic ensemble interacting with a single-mode quantized light field. Effective Hamiltonians are derived and diagonalized to investigate numerically their eigenfrequencies for different quantum phases in the system. Based on the analysis of the eigenfrequencies, an intriguing quantum-phase transition from a normal phase to a superradiant phase is revealed clearly, which is quite different from that observed with a standard Dicke model.

Renato Fedele, P. K. Shukla, ANTONINO ZICHICHI

Vladimir S. Malinovsky, Sebastián Carrasco, Vladan Vuletić