Due to the presence of strong correlations, theoretical or experimentalinvestigations of quantum many-body systems belong to the most challengingtasks in modern physics. Stimulated by tensor networks, we propose a scheme ofconstructing the few-body models that can be easily accessed by theoretical orexperimental means, to accurately capture the ground-state properties ofinfinite many-body systems in higher dimensions. The general idea is to embed asmall bulk of the infinite model in an "entanglement bath" so that themany-body effects can be faithfully mimicked. The approach we propose isefficient, simple, flexible, sign-problem-free, and it directly accesses thethermodynamic limit. The numerical results of the spin models on honeycomb andsimple cubic lattices show that the ground-state properties including quantumphase transitions and the critical behaviors are accurately captured by only$\mathcal{O}(10)$ physical and bath sites. Moreover, since the few-bodyHamiltonian only contains local interactions among a handful of sites, our workprovides new ways of studying the many-body phenomena in the infinitestrongly-correlated systems by mimicking them in the few-body experiments usingcold atoms/ions, or developing novel quantum devices by utilizing the many-bodyfeatures.
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