Zhao Hongzheng, Smith Adam, Mintert Florian, Knolle Johannes
Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom.
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
Phys Rev Lett. 2021 Oct 8;127(15):150601. doi: 10.1103/PhysRevLett.127.150601.
Quantum many-body scars have been put forward as counterexamples to the eigenstate thermalization hypothesis. These atypical states are observed in a range of correlated models as long-lived oscillations of local observables in quench experiments starting from selected initial states. The long-time memory is a manifestation of quantum nonergodicity generally linked to a subextensive generation of entanglement entropy, the latter of which is widely used as a diagnostic for identifying quantum many-body scars numerically as low entanglement outliers. Here we show that by adding kinetic constraints to a fractionalized orthogonal metal, we can construct a minimal model with orthogonal quantum many-body scars leading to persistent oscillations with infinite lifetime coexisting with rapid volume-law entanglement generation. Our example provides new insights into the link between quantum ergodicity and many-body entanglement while opening new avenues for exotic nonequilibrium dynamics in strongly correlated multicomponent quantum systems.
量子多体伤疤已被提出作为本征态热化假说的反例。在一系列关联模型中，从选定的初始态开始的猝灭实验中，作为局部可观测量的长寿命振荡，可以观察到这些非典型态。长时间记忆是量子非遍历性的一种表现，通常与纠缠熵的亚广延生成有关，后者被广泛用作一种诊断方法，用于在数值上识别作为低纠缠异常值的量子多体伤疤。在这里我们表明，通过向一个分数化正交金属添加动力学约束，我们可以构建一个具有正交量子多体伤疤的最小模型，该模型导致具有无限寿命的持续振荡与快速的体积律纠缠生成共存。我们的例子为量子遍历性与多体纠缠之间的联系提供了新的见解，同时为强关联多组分量子系统中的奇异非平衡动力学开辟了新途径。
