Abstract
There is a growing interest in using cold-atom systems to explore the effects of strong interactions in topological band structures. Here we investigate interacting bosons in a Cruetz ladder, which is characterised by topological flat energy bands where it has been proposed that interactions can lead to the formation of bound atomic pairs giving rise to pair superfluidity. By investigating realistic experimental implementations, we understand how the lattice topology enhances the properties of bound pairs giving rise to relatively large effective pair-tunnelling in these systems which can lead to robust pair superfluidity, and we find lattice supersolid phases involving only pairs. We identify schemes for preparation of these phases via time-dependent parameter variation and look at ways to detect and characterise these systems in a lattice. This work provides a starting point for investigating the interplay between the effects of topology, interactions and pairing in more general systems, with potential future connections to quantum simulation of topological materials.
Highlights
Recent experiments have demonstrated the utility of ultra-cold atoms in optical lattices to explore the physics of topological quantum systems [1,2,3,4,5,6,7,8,9,10,11,12]
We have considered the experimental opportunities of using the Creutz ladder to investigate the interplay between topological band structures and strong interactions
By analysing the properties of single repulsively bound pairs we found that the topology greatly enhances the stability and kinetic energy of formed pairs making it possible to realise and investigate pair superfluid phases in experiments with cold-atoms
Summary
Department of Physics and SUPA, The University of Strathclyde, John Anderson Building, 107 Rottenrow East, Glasgow G4 0NG, United Kingdom 1 Author to whom any correspondence should be addressed. Keywords: cold atoms, topological band structures, pair superfluid, lattice supersolid, flat bands Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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