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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Gases (Bosons) II
Q 8.8: Talk
Monday, March 14, 2022, 18:15–18:30, Q-H10
Quantum phases of a dipolar gas of bosons in an one-dimensional optical lattice — •Rebecca Kraus1, Titas Chanda2,3, Jakub Zakrzewski2,4, and Giovanna Morigi1 — 1Theoretical Physics, Saarland University, Saarbrücken, Germany — 2Institute of Theoretical Physics, Jagiellonian University, Kraków, Poland — 3ICTP, Trieste, Italy — 4Mark Kac Complex Systems Research Center, Jagiellonian University, Kraków, Poland
We present a theoretical analysis of the phase diagram of ultracold bosons in a lattice and interacting with long-range forces decaying with the inter-particle distance. The theoretical model is an extended Bose-Hubbard model and describes the dynamics of ultracold atoms in optical lattices realised in present experimental platforms. We determine the ground state in one dimension using numerical programs based on tensor networks. We focus in particular on parameters for which quantum fluctuations compete with the interaction-induced correlated hopping between lattice sites. We analyse the phases emerging from the competition of these two mechanisms. For larger densities we identify the parameters where correlated hopping and quantum fluctuations destructively interfere. This quantum interference leads to insulating phases at relatively large kinetic energies, where one would otherwise expect superfluidity. For unit density our results predict that correlated tunnelling can significantly modify the parameter range where the topological phase is found. At vanishing values of the onsite interactions, moreover, correlated tunnelling promotes here the onset of a phase separation.