论文标题
量子变质
Quantum metamorphism
论文作者
论文摘要
晶体形成规则和健壮的结构，在极端条件下可以在称为晶体变质的过程中融化并重结合到不同的排列中。尽管由于空间中连续翻译对称性的破坏而存在晶体，但最近有人提出，离散的晶体顺序也可以随时间出现，并将其提升到一个新型的物质阶段，称为离散时间晶体（DTC）。在本文中，我们加入了这两个想法，并提出了一个模型，用于在不同周期性的两个DTC（2T和4T-DTC）之间进行量子变质。在我们的模型中，变质的条件来自4T-DTC Hamiltonian中扰动项的调节，该术语逐渐融化其结构并将其转化为2T-DTC。从许多定期驱动系统的许多体物理学的角度详细研究了此过程。我们还提出了一种使用当前量子技术实验观察量子变质的方案。
Crystals form regular and robust structures that under extreme conditions can melt and recrystallize into different arrangements in a process that is called crystal metamorphism. While crystals exist due to the breaking of a continuous translation symmetry in space, it has recently been proposed that discrete crystalline order can also emerge in time and give raise to a novel phase of matter named discrete time crystal (DTC). In this paper, we join these two ideas and propose a model for quantum metamorphism between two DTCs of different periodicity, a 2T and 4T-DTC. In our model the conditions for metamorphism come from the modulation of perturbative terms in the 4T-DTC Hamiltonian that gradually melt its structure and transform it into a 2T-DTC. This process is studied in detail from the viewpoint of manybody physics of periodically driven systems. We also propose a protocol to experimentally observe quantum metamorphism using current quantum technology.
