论文标题
Bogolon介导的不同维度的原子冷凝物中的光吸收
Bogolon-mediated light absorption in atomic condensates of different dimensionality
论文作者
论文摘要
在无结构的玻色子的情况下，冷却至低温，由于动量和节能法则，通常禁止使用玻色 - 内施坦冷凝物电磁波吸收：凝管的集体模式的相位速度被称为Bogolons的相位速度比光速较低。因此，只有光散射过程持续存在。但是，在复合玻色子或具有内部结构的玻色子的情况下，情况可能有所不同。在这里，我们利用弱相互交互的玻色气体的Bogoliubov模型来开发一种通过冷原子的玻色子凝结物在各个维度上的玻色网凝结物吸收的微观理论。因此，我们解决了玻色子的集体相干状态与离散的能量水平之间的转变，这些能量水平对应于激发的内部自由度的非牢固单个玻色子的自由度。据表明，这种转变是由凝结物上方的一个和两个阳离子激发介导的，这表明在不同频率下表现出不同的效率，并且在很大程度上取决于冷凝水密度，这会根据系统的尺寸而变化。
In the case of structureless bosons, cooled down to low temperatures, the absorption of electromagnetic waves by their Bose-Einstein condensate is usually forbidden due to the momentum and energy conservation laws: the phase velocity of the collective modes of the condensate called bogolons is sufficiently lower than the speed of light. Thus, only the light scattering processes persist. However, the situation might be different in the case of composite bosons or the bosons with an internal structure. Here, we develop a microscopic theory of electromagnetic power absorption by a Bose-Einstein condensates of cold atoms in various dimensions, utilizing the Bogoliubov model of a weakly-interacting Bose gas. Thus, we address the transitions between a collective coherent state of bosons and the discrete energy levels corresponding to excited internal degrees of freedom of non-condensed individual bosons. It is shown, that such transitions are mediated by one and two-bogolon excitations above the condensate, which demonstrate different efficiency at different frequencies and strongly depend on the condensate density, which influence varies depending on the dimensionality of the system.
