Critical Property of the Geometric Phase in the Dicke Model with the Dipole-dipole Interactions
WU Yun-feng, Ping Zhang, Zheng Jian-zhou
We obtained the ground-state energy level and associated geometric phase in the Dicke model with the dipoledipole interactions analytically by the Holstein-Primakoff transformation and the boson expansion approach in the thermodynamic limit. The nonadiabatic geometric phase induced by the photon field was derived with the time-dependent unitary transformation. It is shown that dipole-dipole interactions have a deep influence on scaled behavior of the geometric phase at the critical point.
Journal of Material Science and Technology•Oct 10, 2009•1 citation