The effect of a permanent dipole moment on the polar molecule cavity quantum electrodynamics

• Published in: Chinese physics B Vol. 25; no. 4; pp. 127 - 136
• Main Author: 赵晶云 秦立国 蔡勋明 林强 王中阳
• Format: Journal Article
• Language: English
• Published: 01.04.2016
• Subjects: Approximation; Coupling; Dipole moment; Dipoles; Holes; Mathematical analysis; Mathematical models; Product data management; 偶极矩; 极性分子; 永久; 激发态能谱; 直接数值模拟; 腔量子电动力学; 解析表达式; 量子电动力学效应
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/25/4/044202

A dressed-state perturbation theory beyond the rotating wave approximation （RWA） is presented to investigate the interaction between a two-level electronic transition of polar molecules and a quantized cavity field. Analytical expressions can be explicitly derived for both the ground- and excited-state-energy spectrums and wave functions of the system, where the contribution of permanent dipole moments （PDM） and the counter-rotating wave term （CRT） can be shown separately. The validity of these explicit results is discussed by comparison with the direct numerical simulation. Compared to the CRT coupling, PDM results in the coupling of more dressed states and the energy shift is proportional to the square of the normalized permanent dipole difference, and a greater Bloch-Siegert shift can be produced in the giant dipole molecule cavity QED. In addition, our method can also be extended to the solution of the two-level atom Rabi model Hamiltonian beyond the RWA.