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Helical superfluid in a frustrated honeycomb Bose-Hubbard model
- Source :
- Phys. Rev. A 106, 023321 (2022)
- Publication Year :
- 2022
-
Abstract
- We study a "helical" superfluid, a nonzero-momentum condensate in a frustrated bosonic model. At mean-field Bogoliubov level, such a novel state exhibits "smectic" fluctuation that are qualitatively stronger than that of a conventional superfluid. We develop a phase diagram and compute a variety of its physical properties, including the spectrum, structure factor, condensate depletion, momentum distribution, all of which are qualitatively distinct from that of a conventional superfluid. Interplay of fluctuations, interaction and lattice effects gives rise to the phenomenon of order-by-disorder, leading to a crossover from the smectic superfluid regime to the anisotropic XY superfluid phase. We complement the microscopic lattice analysis with a field theoretic description for such a helical superfluid, which we derive from microscopics and justify on general symmetry grounds, reassuringly finding full consistency. Possible experimental realizations are discussed.<br />Comment: 29 pages, 13 figures. Version published in PRA, with minor edits
- Subjects :
- Condensed Matter - Quantum Gases
Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. A 106, 023321 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2206.00013
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevA.106.023321