发表机构
University of Michigan（密歇根大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究双原子超辐射中角动量守恒，发现因激发态交换，场中最终角动量可异于初始值，缺失部分转化为原子轨道角动量。
AI 中文摘要
研究了具有J=0基态和J=1激发态的原子的双原子超辐射。原子位于x轴上，并由沿z方向传播的σ+偏振激光脉冲激发。我们采用两种互补的方法来获得场中的最终角动量，即源场方法和薛定谔绘景方法。两种方法给出了相同的结果，但在这两种计算中都必须包含那些乍一看可能预期不会产生贡献的项。我们表明，由于原子1处于其m=1激发态且原子2处于其基态的状态与原子2处于其m=-1激发态且原子1处于其基态的状态之间的交换，场中的最终角动量不一定等于双原子系统中的初始角动量。缺失的角动量表现为两个原子的轨道角动量。
英文摘要
Two-atom superradiance is studied for atoms having a J=0 ground state and a J=1 excited state. The atoms lie on the x-axis and are excited by a σ_{+}-polarized laser pulse propagating in the z-direction. We use two, complementary approaches to obtain the final angular momentum in the field, a source-field approach and a Schrodinger picture approach. Both approaches give identical answers, but it is necessary to include terms in both calculations that, at first glance, might not be expected to contribute. We show that, owing to an exchange between a state in which atom 1 is in its m=1 excited state and atom 2 is in its ground state to one in which atom 2 is in its m=-1 excited state and atom 1 in its ground state, the final angular momentum in the field is not necessarily equal to the initial angular momentum in the two-atom system. The missing angular momentum appears as orbital angular momentum of the two atoms.
Comments25 pages, 4 figures
