Quantum many-body scars in spin models with multibody interactions
arXiv:2304.13624 · doi:10.1103/PhysRevB.108.155102
Abstract
We introduce and study several classes of quantum spin models with multi-body interactions that exhibit quantum many-body scars. The models are constructed by two different methods: one exploiting boundary states in integrable spin chains and the other based on a variant of existing methods such as restricted spectrum generating algebras. The first method allows us to construct deformations of the Majumdar-Ghosh and Affleck-Kennedy-Lieb-Tasaki models -- prototypes of frustration-free systems. With the second method, we construct a large class of spin- models involving scalar spin chirality in both one and two dimensions. Interestingly, in some cases, the models so constructed have towers of scar states of different character. For each example, we show that the scar states behave differently from thermal states by comparing their spectral and dynamical properties with those of other states. We also show that a superposition of the scar states constructed by the second method exhibits perfectly periodic revivals in the dynamics.
arXiv comment30 pages, 24 figures; v3: some discussions and references added, some typos corrected
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