Cortese Erika, Lagoudakis Pavlos G, De Liberato Simone
School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom.
Skolkovo Institute of Science and Technology, Novaya St., 100, Skolkovo 143025, Russian Federation.
Phys Rev Lett. 2017 Jul 28;119(4):043604. doi: 10.1103/PhysRevLett.119.043604. Epub 2017 Jul 27.
We investigate a cavity quantum electrodynamic effect, where the alignment of two-dimensional freely rotating optical dipoles is driven by their collective coupling to the cavity field. By exploiting the formal equivalence of a set of rotating dipoles with a polymer we calculate the partition function of the coupled light-matter system and demonstrate that it exhibits a second order phase transition between a bunched state of isotropic orientations and a stretched one with all the dipoles aligned. Such a transition manifests itself as an intensity-dependent shift of the polariton mode resonance. Our work, lying at the crossroad between cavity quantum electrodynamics and quantum optomechanics, is a step forward in the ongoing quest to understand how strong coupling can be exploited to influence matter internal degrees of freedom.
我们研究了一种腔量子电动力学效应，其中二维自由旋转的光学偶极子的排列是由它们与腔场的集体耦合驱动的。通过利用一组旋转偶极子与聚合物的形式等价性，我们计算了耦合光物质系统的配分函数，并证明它在各向同性取向的聚集态和所有偶极子排列一致的拉伸态之间表现出二阶相变。这种相变表现为极化激元模式共振的强度依赖性频移。我们的工作处于腔量子电动力学和量子光力学的交叉点，是在持续探索如何利用强耦合来影响物质内部自由度方面向前迈出的一步。
