Chiral and pair superfluidity in triangular ladder produced by state-dependent Kronig-Penney lattice
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866911485879386112 |
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| author | Burba, Domantas Žlabys, Giedrius Viarbitski, Dzmitry Busch, Thomas Juzeliūnas, Gediminas |
| author_facet | Burba, Domantas Žlabys, Giedrius Viarbitski, Dzmitry Busch, Thomas Juzeliūnas, Gediminas |
| contents | We propose a concrete realization of a triangular ladder for ultracold atoms, which simultaneously hosts geometric frustration and unusual two-body interactions, and in particular controllable pair hopping and density-induced tunneling. This is done by means of a spin-dependent Kronig-Penney lattice created using a spatially-dependent tripod-type atom-light coupling. We apply density matrix renormalization group (DMRG) calculations to derive the quantum phase diagram. We find that pair tunneling stabilizes a robust pair superfluid, characterized by power-law decay of pair correlations. Additionally, a chiral superfluid arises from frustration induced by competing nearest neighbor (NN) and next-nearest neighbor (NNN) tunnelings. Finally, in the high barrier regime, we map our system onto the XXZ spin model and find the exact phase transition points. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_04498 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Chiral and pair superfluidity in triangular ladder produced by state-dependent Kronig-Penney lattice Burba, Domantas Žlabys, Giedrius Viarbitski, Dzmitry Busch, Thomas Juzeliūnas, Gediminas Quantum Gases Quantum Physics We propose a concrete realization of a triangular ladder for ultracold atoms, which simultaneously hosts geometric frustration and unusual two-body interactions, and in particular controllable pair hopping and density-induced tunneling. This is done by means of a spin-dependent Kronig-Penney lattice created using a spatially-dependent tripod-type atom-light coupling. We apply density matrix renormalization group (DMRG) calculations to derive the quantum phase diagram. We find that pair tunneling stabilizes a robust pair superfluid, characterized by power-law decay of pair correlations. Additionally, a chiral superfluid arises from frustration induced by competing nearest neighbor (NN) and next-nearest neighbor (NNN) tunnelings. Finally, in the high barrier regime, we map our system onto the XXZ spin model and find the exact phase transition points. |
| title | Chiral and pair superfluidity in triangular ladder produced by state-dependent Kronig-Penney lattice |
| topic | Quantum Gases Quantum Physics |
| url | https://arxiv.org/abs/2603.04498 |