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Many-Body Bound States in the Continuum
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A bound state in the continuum (BIC) is a spatially bounded energy eigenstate lying in a continuous spectrum of extended eigenstates. While various types of single-particle BICs have been found in the literature, whether or not BICs can exist in genuinely many-body systems remains inconclusive. Here, we provide numerical and analytical pieces of evidence for the existence of many-body BICs in a one-dimensional Bose-Hubbard chain with an attractive impurity potential, which was previously known to host a BIC in the two-particle sector. We also demonstrate that the many-body BICs prevent the system from thermalization when one starts from simple initial states that can be prepared experimentally.
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Hierarchy of localized many-body bound states in an interacting open lattice
Localized many-body bound states in an open interacting fermionic lattice are traced to asymmetric string solutions of the Bethe ansatz, with recurrence relations predicting a hierarchy of such states.
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