论文标题
Floquet Conformal Field Theories具有一般变形的哈密顿人
Floquet conformal field theories with generally deformed Hamiltonians
论文作者
论文摘要
在这项工作中,我们研究了1+1D的Floquet保形场理论(CFTS)中的非平衡动力学,其中驱动汉密尔顿式的涉及通过任意平滑功能在空间调节的能量摩托米密度。这概括了早期的工作,该工作仅限于在$ \ mathfrak {sl} _2 $ sub-algebra中运行的正弦方变形类型。在这里,我们表明,基于几何方法,该问题在这种涉及完整的Virasoro代数的广义情况下仍然存在。发现相图取决于操作员进化的频道轨迹。操作员演变中空间固定点的存在/不存在表明驱动的CFT处于加热/非加热阶段,其中纠缠熵在时及时增长/振荡。此外,加热状态进一步细分为多个阶段,具有不同的纠缠模式和能量摩孔密度的空间分布,其特征在于空间固定点的数量。这些不同的加热阶段之间的相变可以仅通过改变驱动哈密顿式驾驶的持续时间来实现。我们通过混凝土CFT示例演示了一般特征,并将结果与晶格计算进行了比较,并发现了显着的一致性。
In this work, we study non-equilibrium dynamics in Floquet conformal field theories (CFTs) in 1+1D, in which the driving Hamiltonian involves the energy-momentum density spatially modulated by an arbitrary smooth function. This generalizes earlier work which was restricted to the sine-square deformed type of Floquet Hamiltonians, operating within a $\mathfrak{sl}_2$ sub-algebra. Here we show remarkably that the problem remains soluble in this generalized case which involves the full Virasoro algebra, based on a geometrical approach. It is found that the phase diagram is determined by the stroboscopic trajectories of operator evolution. The presence/absence of spatial fixed points in the operator evolution indicates that the driven CFT is in a heating/non-heating phase, in which the entanglement entropy grows/oscillates in time. Additionally, the heating regime is further subdivided into a multitude of phases, with different entanglement patterns and spatial distribution of energy-momentum density, which are characterized by the number of spatial fixed points. Phase transitions between these different heating phases can be achieved simply by changing the duration of application of the driving Hamiltonian. We demonstrate the general features with concrete CFT examples and compare the results to lattice calculations and find remarkable agreement.