Time-Resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
Open accessAbstract
Quantum mechanical superexchange interactions form the basis of quantum magnetism in strongly correlated electronic media. We report on the direct measurement of superexchange interactions with ultracold atoms in optical lattices. After preparing a spin-mixture of ultracold atoms in an antiferromagnetically ordered state, we measured coherent superexchange-mediated spin dynamics with coupling energies from 5 hertz up to 1 kilohertz. By dynamically modifying the potential bias between neighboring lattice sites, the magnitude and sign of the superexchange interaction can be controlled, thus allowing the system to be switched between antiferromagnetic and ferromagnetic spin interactions. We compare our findings to predictions of a two-site Bose-Hubbard model and find very good agreement, but are also able to identify corrections that can be explained by the inclusion of direct nearest-neighbor interactions.
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Recent experiments use exchange interactions in double-well potentials to create arrays of robust Bell pairs, which could be used as an alternative way to create cluster states in the lattice.
“Recent experiments use exchange interactions in double-well potentials to create arrays of robust Bell pairs, which could be used as an alternative way to create cluster states in the lattice 29,30”
From Measurement-based quantum computation (2009) · cites this paper as [30]
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“We also calculate the fractional frequency shifts due to superexchange interactions [162] between neighboring sites at typical lattice depths and find them to be below 1× 10−22.”
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- Authors
- Trotzky, S., Cheinet, P., Fölling, S., Feld, M., Schnorrberger, U., Rey, A. M., Polkovnikov, A., Demler, E. A., Lukin, M. D., & Bloch, I.
- Affiliations
- Boston University (US)
- Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
- Corresponding author
- Trotzky, S.
- Cheinet, P.
- Bloch, I.
- Venue
- Science
- Published
- 2008-01-18
- Volume
- 319
- Issue
- 5861
- Pages
- 295-299
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2049883489
- Cited by
- 698
- References
- 36
- Citations by year
- 2026: 15 · 2025: 24 · 2024: 26 · 2023: 29 · 2022: 30 · 2021: 24 · 2020: 28 · 2019: 21 · 2018: 34 · 2017: 37 · 2016: 54 · 2015: 34 · 2014: 54 · 2013: 51 · 2012: 41
- FWCI
- 27.74
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Max Planck Digital Library (submittedVersion)
- MPG.PuRe (Max Planck Society) (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 › Atomic and Molecular Physics, and Optics › Quantum many-body systems
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Keywords
- superexchange, ultracold atoms, optical lattices, spin dynamics, antiferromagnetic ordering, ferromagnetic ordering, Bose-Hubbard model, quantum magnetism, time-resolved measurement, nearest-neighbor interactions
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