论文标题
淬灭的2D玻色气体中动态BKT过渡的通用缩放
Universal Scaling of the Dynamic BKT Transition in Quenched 2D Bose Gases
论文作者
论文摘要
虽然重新归一化群体理论是捕获平衡相变的一种完全建立的方法，但RG理论对通用非平衡行为的适用性仍然难以捉摸。在这里，我们通过测量从2D Bose气体中的Berezinskii-Kosterlitz-毫无疑问的液相触发的非平衡动力学来解决这个问题。我们通过将2D气体分为两次，并通过物质波干涉测量测量相关函数和涡流密度来探测弛豫动力学。动力学通过快速声子热化的两步过程进行，然后是缓慢的动态涡流解开。我们展示了在经典场模拟的支持下为代数指数和涡旋密度的普遍缩放定律，并显示了它们与实时RG理论的一致性。
While renormalization group theory is a fully established method to capture equilibrium phase transitions, the applicability of RG theory to universal non-equilibrium behavior remains elusive. Here we address this question by measuring the non-equilibrium dynamics triggered by a quench from superfluid to thermal phase across the Berezinskii-Kosterlitz-Thouless transition in a 2D Bose gas. We quench the system by splitting the 2D gas in two and probe the relaxation dynamics by measuring the phase correlation function and vortex density via matter-wave interferometry. The dynamics occur via a two-step process of rapid phonon thermalization followed by slow dynamic vortex unbinding. We demonstrate universal scaling laws for the algebraic exponents and vortex density, supported by classical-field simulations, and show their agreement with the real-time RG theory.
