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  Controllable finite-momenta dynamical quasicondensation in the periodically driven one-dimensional Fermi-Hubbard model

Cook, M. W., & Clark, S. R. (2020). Controllable finite-momenta dynamical quasicondensation in the periodically driven one-dimensional Fermi-Hubbard model. Physical Review A, 101(3): 033604. doi:10.1103/PhysRevA.101.033604.

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PhysRevA.101.033604.pdf (Publisher version), 5MB
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2020
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© American Physical Society

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https://arxiv.org/abs/1906.05412 (Preprint)
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https://dx.doi.org/10.1103/PhysRevA.101.033604 (Publisher version)
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 Creators:
Cook, M. W.1, Author
Clark, S. R.2, 3, Author              
Affiliations:
1Department of Physics, University of Bath, ou_persistent22              
2H. H. Wills Physics Laboratory, University of Bristol, ou_persistent22              
3Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              

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 Abstract: In the strongly interacting limit of the Hubbard model localized double occupancies form effective hard-core bosonic excitations, called doublons, which are long lived due to energy conservation. Using time-dependent density-matrix renormalization group methods we investigate numerically the dynamics of doublons arising from the sudden expansion of a spatially confined band-insulating state in one spatial dimension. By analyzing the occupation scaling of the natural orbitals within the many-body state, we show that doublons dynamically quasicondense at the band edges, consistent with the spontaneous emergence of an η quasicondensate. Building on this, we study the effect of periodically driving the system during the expansion. Floquet analysis reveals that doublon hopping and doublon repulsion are strongly renormalized by the drive, breaking the η−SU(2) symmetry of the Hubbard model. Numerical simulation of the driven expansion dynamics demonstrates that the momentum in which doublons quasicondense can be controlled by the driving amplitude. These results point to new pathways for engineering nonequilibrium condensates in fermionic cold-atom experiments and are potentially relevant to driven solid-state systems.

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Language(s): eng - English
 Dates: 2020-01-202019-06-142020-02-032020-03-092020-03
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 1906.05412
DOI: 10.1103/PhysRevA.101.033604
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Title: Physical Review A
  Other : Physical Review A: Atomic, Molecular, and Optical Physics
  Other : Phys. Rev. A
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 101 (3) Sequence Number: 033604 Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: https://pure.mpg.de/cone/journals/resource/954925225012_2