论文标题
量子多体疤痕：准粒子透视图
Quantum Many-Body Scars: A Quasiparticle Perspective
论文作者
论文摘要
弱相互作用的准颗粒在对量子物质许多阶段的低能描述中起着核心作用。然而，在较高的能量下，由于衰减通道的扩散，准粒子在通用多体系统中停止了明确的定义。在这篇综述中，我们讨论了量子多体疤痕的现象，这些现象可以在整个能源范围内引起某些稳定的准粒子。这与一套不寻常的非平衡现象，包括多体复兴和非热固定状态。我们通过一个简单而全面的示例（Spin-1 XY模型）提供了该物理的教学博览会。我们将讨论放在基于对称性的多体疤痕状态，投影仪嵌入和希尔伯特太空碎片的更广泛背景下。我们总结了实验进步和理论难题的总结。
Weakly interacting quasiparticles play a central role in the low-energy description of many phases of quantum matter. At higher energies, however, quasiparticles cease to be well-defined in generic many-body systems due to a proliferation of decay channels. In this review, we discuss the phenomenon of quantum many-body scars, which can give rise to certain species of stable quasiparticles throughout the energy spectrum. This goes along with a set of unusual non-equilibrium phenomena including many-body revivals and non-thermal stationary states. We provide a pedagogical exposition of this physics via a simple yet comprehensive example, that of a spin-1 XY model. We place our discussion in the broader context of symmetry-based constructions of many-body scar states, projector embeddings, and Hilbert space fragmentation. We conclude with a summary of experimental progress and theoretical puzzles.
