标题： 时空秩序和从第一性原理的参数不稳定性 显示英文标题

标题： Spatiotemporal Order and Parametric Instabilities from First-Principles

摘要： 用光塑造晶体结构是物理学和材料工程的一个长期目标。 这里我们展示了在对称性选择的候选材料中进行的计算，这些材料允许光诱导的空间-时间参数不稳定性。 我们展示了一个理论框架，该框架包括对所有非中心对称点群中导致参数不稳定性声子模式的完整对称性分析，对材料景观的详细调查，以及从第一性原理计算非线性耦合。 随后，我们展示了手性晶体、铁电体和层状范德华材料的详细结果。 我们的结果为在量子材料中实现可设计的时间晶体秩序铺平了道路，这种秩序可通过时间分辨衍射探测器检测到。 显示英文摘要

摘要： Shaping crystal structure with light is an enduring goal of physics and materials engineering. Here we present calculations in candidate materials selected by symmetry that allow light-induced spatiotemporal parametric instabilities. We demonstrate a theoretical framework that includes a complete symmetry analysis of phonon modes that contribute to parametric instabilities across all non-centrosymmetric point groups, a detailed survey of the materials landscape and finally the computation of nonlinear couplings from first principles. We then showcase detailed results for chiral crystals, ferroelectrics, and layered van der Waals materials. Our results pave the way towards realizing designer time-crystalline order in quantum materials, detectable with time-resolved diffractive probes.