Spin-imbalance in a one-dimensional Fermi gas
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Superconductivity and magnetism generally do not coexist. Changing the relative number of up and down spin electrons disrupts the basic mechanism of superconductivity, where atoms of opposite momentum and spin form Cooper pairs. Nearly forty years ago Fulde and Ferrell and Larkin and Ovchinnikov (FFLO) proposed an exotic pairing mechanism in which magnetism is accommodated by the formation of pairs with finite momentum. Despite intense theoretical and experimental efforts, however, polarized superconductivity remains largely elusive. Unlike the three-dimensional (3D) case, theories predict that in one dimension (1D) a state with FFLO correlations occupies a major part of the phase diagram. Here we report experimental measurements of density profiles of a two-spin mixture of ultracold (6)Li atoms trapped in an array of 1D tubes (a system analogous to electrons in 1D wires). At finite spin imbalance, the system phase separates with an inverted phase profile, as compared to the 3D case. In 1D, we find a partially polarized core surrounded by wings which, depending on the degree of polarization, are composed of either a completely paired or a fully polarized Fermi gas. Our work paves the way to direct observation and characterization of FFLO pairing.
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The most advanced experiments with AQSs have been with ultracold atoms in optical lattices.
“The most advanced experiments with AQSs have been with ultracold atoms in optical lattices [3, 5-15, 19, 71].”
From Can one trust quantum simulators? (2012) · cites this paper as [10]
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Research works printed but not linked: 1
- [6]Baur, S. K., Shumway, J. & Mueller, E. J. FFLO vs Bose-Fermi mixture in polarized 1D Fermi gas on a Feshbach resonance: a 3-body study. Preprint at <http://arxiv.org/abs/0902.4653> (2009). · arXiv
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Can one trust quantum simulators?
Hauke, P., Cucchietti, F. M., Tagliacozzo, L., Deutsch, I., & Lewenstein, M. (2012) · Reports on Progress in Physics · doi:10.1088/0034-4885/75/8/082401 · Cited by 315 · see citing works
- Authors
- Liao, Y.-A., Rittner, A. S. C., Paprotta, T., Li, W., Partridge, G. B., Hulet, R. G., Baur, S. K., & Mueller, E. J.
- Affiliations
- Rice University (US)
- Centre for Quantum Technologies (SG)
- Cornell University (US)
- Corresponding author
- Hulet, Randall G.
- Venue
- Nature
- Published
- 2010-09
- Volume
- 467
- Issue
- 7315
- Pages
- 567-569
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2166473014
- Cited by
- 532
- References
- 45
- Citations by year
- 2026: 12 · 2025: 10 · 2024: 10 · 2023: 12 · 2022: 21 · 2021: 19 · 2020: 31 · 2019: 25 · 2018: 27 · 2017: 41 · 2016: 51 · 2015: 41 · 2014: 43 · 2013: 48 · 2012: 71
- FWCI
- 32.42
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- Rice Research Repository (Rice University) (acceptedVersion)
- arXiv (Cornell University) (submittedVersion)
- National University of Singapore (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Rice Research Repository (Rice University) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Cold Atom Physics and Bose-Einstein Condensates
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum, superfluid, helium dynamics
- Keywords
- FFLO state, spin imbalance, one-dimensional Fermi gas, phase separation, phase profile, superconducting pairing, coexistence of superconductivity and magnetism
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