Few-body bound topological and flat-band states in a Creutz Ladder
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| Format: | Preprint |
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2024
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| _version_ | 1866911784932212736 |
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| author | Pelegrí, Gerard Flannigan, Stuart Daley, Andrew J. |
| author_facet | Pelegrí, Gerard Flannigan, Stuart Daley, Andrew J. |
| contents | We investigate the properties of few interacting bosons in a Creutz ladder, which has become a standard model for topological systems, and which can be realised in experiments with cold atoms in optical lattices. At the single-particle level, this system may exhibit a completely flat energy landscape with non-trivial topological properties. In this scenario, we identify topological two-body edge states resulting from the bonding of single-particle edge and flat-band states. We also explore the formation of two- and three-body bound states in the strongly-interacting limit, and we show how these quasi-particles can be engineered to replicate the flat-band and topological features of the original single-particle model. Furthermore, we show that in this geometry perfect Aharonov-Bohm caging of two-body bound states may occur for arbitrary interaction strengths, and we provide numerical evidence that the main features of this effect are preserved in an interacting many-body scenario resulting in many-body Aharonov-Bohm caging. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_17494 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Few-body bound topological and flat-band states in a Creutz Ladder Pelegrí, Gerard Flannigan, Stuart Daley, Andrew J. Quantum Gases We investigate the properties of few interacting bosons in a Creutz ladder, which has become a standard model for topological systems, and which can be realised in experiments with cold atoms in optical lattices. At the single-particle level, this system may exhibit a completely flat energy landscape with non-trivial topological properties. In this scenario, we identify topological two-body edge states resulting from the bonding of single-particle edge and flat-band states. We also explore the formation of two- and three-body bound states in the strongly-interacting limit, and we show how these quasi-particles can be engineered to replicate the flat-band and topological features of the original single-particle model. Furthermore, we show that in this geometry perfect Aharonov-Bohm caging of two-body bound states may occur for arbitrary interaction strengths, and we provide numerical evidence that the main features of this effect are preserved in an interacting many-body scenario resulting in many-body Aharonov-Bohm caging. |
| title | Few-body bound topological and flat-band states in a Creutz Ladder |
| topic | Quantum Gases |
| url | https://arxiv.org/abs/2402.17494 |