论文标题
非常规Berezinskii-Kosterlitz-多组分北极星系统
Unconventional Berezinskii-Kosterlitz-Thouless Transition in the Multicomponent Polariton System
论文作者
论文摘要
我们在光学参数振荡器方面研究了一个四成分的极化系统，该系统由跨Berezinskii-Kosterlitz-thouless（BKT）过渡组成的激子/光子和信号/惰轮模式组成。我们表明，所有四个组件具有相同的BKT临界点，并且与相同的临界指数的空间连贯性的代数衰减。但是，尽管不同组件中的集体激发均被强烈锁定，并且远离关键性，但发现相变附近拓扑缺陷的自发产生在很大程度上与组分间模式锁定很大程度上无关，而是强烈依赖于给定模式的密度。这种特殊的特征使我们能够揭示出一种新的物质状态，其特征是拓扑缺陷的构型在超氟中的拓扑缺陷中增殖，并具有连贯性的代数衰减，观察到了这些衰减，这被证明是当前实验的范围。
We study a four-component polariton system in the optical parametric oscillator regime consisting of exciton/photon and signal/idler modes across the Berezinskii-Kosterlitz-Thouless (BKT) transition. We show that all four components share the same BKT critical point, and algebraic decay of spatial coherence with the same critical exponent. However, while the collective excitations in different components are strongly locked, both close to and far from criticality, the spontaneous creation of topological defects in the vicinity of the phase transition is found to be largely independent of the inter-component mode locking, and instead strongly dependent on the density within a given mode. This peculiar characteristic allows us to reveal a novel state of matter, characterised by configurations of topological defects proliferating on top of a superfluid with algebraic decay of coherence, observation of which is demonstrated to be within reach of current experiments.
