Bloch oscillations along a synthetic dimension of atomic trap states

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Journal Title
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-07
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Language
en
Pages
18
1-18
Series
PHYSICAL REVIEW RESEARCH, Volume 5, issue 3
Abstract
Synthetic dimensions provide a powerful approach for simulating condensed matter physics in cold atoms and photonics, whereby a set of discrete degrees of freedom are coupled together and reinterpreted as lattice sites along an artificial spatial dimension. However, atomic experimental realizations have been limited so far by the number of artificial lattice sites that can be feasibly coupled along the synthetic dimension. Here, we experimentally realize for the first time a very long and controllable synthetic dimension of atomic harmonic trap states. To create this, we couple trap states by dynamically modulating the trapping potential of the atomic cloud with patterned light. By controlling the detuning between the frequency of the driving potential and the trapping frequency, we implement a controllable force in the synthetic dimension. This induces Bloch oscillations in which atoms move periodically up and down tens of atomic trap states. We experimentally observe the key characteristics of this behaviorin the real-space dynamics of the cloud, and verify our observations with numerical simulations and semiclassical theory. The Bloch oscillations thus act as a smoking-gun signature of the synthetic dimension, and allow us to characterize the effective band structure. Our methods provide an efficient approach for the manipulation and control of highly excited trap states, and set the stage for the future exploration of topological physics in higher dimensions through the use of a tunable artificial gauge field and finite-range interactions.
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Funding Information: We would like to acknowledge helpful discussions with Bruno Peaudecerf, David Guéry-Odelin, Tilman Esslinger, Laura Corman, and Jean-Philippe Brantut. We acknowledge financial support by the Royal Society via Grants No. UF160112, No. RGFEA180121, and No. RGFR1180071, and the EPSRC via Grant No. EP/R021236/1. N.G. is supported by the ERC Starting Grant TopoCold and the Fonds De La Recherche Scientifique (FRS-FNRS, Belgium). G.S. was supported by the ERC Starting Grant TopoCold, the Academy of Finland under Project No. 327293, and the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 101025211 (TEBLA). | openaire: EC/H2020/101025211/EU//TEBLA
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Citation
Oliver , C , Smith , A , Easton , T , Salerno , G , Guarrera , V , Goldman , N , Barontini , G & Price , H M 2023 , ' Bloch oscillations along a synthetic dimension of atomic trap states ' , PHYSICAL REVIEW RESEARCH , vol. 5 , no. 3 , 033001 , pp. 1-18 . https://doi.org/10.1103/PhysRevResearch.5.033001