Mobile impurities interacting with a few one-dimensional lattice bosons

• URL: http://arxiv.org/abs/2207.09309v1
• Date: Tue, 19 Jul 2022 14:49:51 GMT
• Title: Mobile impurities interacting with a few one-dimensional lattice bosons
• Authors: Vasil R. Yordanov, Felipe Isaule
• Abstract summary: We report a comprehensive study of the ground-state properties of one and two bosonic impurities immersed in small one-dimensional optical lattices loaded with a few bosons. We report polaron and bipolaron energies across the superfluid to Mott-insulator transition and confirm the formation of bipolaron bound states induced by repulsive interactions.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report a comprehensive study of the ground-state properties of one and two bosonic impurities immersed in small one-dimensional optical lattices loaded with a few interacting bosons. We model the system with a two-component Bose-Hubbard model and solve the problem numerically by means of the exact diagonalization method. We report polaron and bipolaron energies across the superfluid to Mott-insulator transition and confirm the formation of bipolaron bound states induced by repulsive interactions. In particular, we found that an insulator bath induces tightly bound bipolarons, whereas a superfluid bath induces shallower bound states.

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