Chiral and pair superfluidity in triangular ladder produced by state-dependent Kronig-Penney lattice

• URL: http://arxiv.org/abs/2603.04498v1
• Date: Wed, 04 Mar 2026 19:00:02 GMT
• Title: Chiral and pair superfluidity in triangular ladder produced by state-dependent Kronig-Penney lattice
• Authors: Domantas Burba, Giedrius Žlabys, Dzmitry Viarbitski, Thomas Busch, Gediminas Juzeliūnas,
• Abstract summary: We propose a triangular ladder for ultracold atoms, which simultaneously hosts geometric frustration and unusual two-body interactions.<n>We find that pair tunneling stabilizes a robust pair superfluid, characterized by power-law decay of pair correlations.<n>A chiral superfluid arises from frustration induced by competing nearest neighbor (NN) and next-nearest neighbor (NNN) tunnelings.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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