Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Cavity-induced density wave ordering in strongly correlated Fermi gases

Jul 21, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session


The interplay of pairing with density wave order is one of the most prominent feature of strongly correlated electronics systems, such as high temperature superconductors. We have realized a Fermi gas with short and long range interactions, independently and simultaneously controllable. Starting from a quantum degenerate, unitary Fermi in a cavity [1-4], we pump the system from the side in the dispersive regime to yield a tunable photon-mediated interaction that favors the self-organization of atoms into a density wave order. We show that this interaction is broadly tunable, and study the onset of density wave ordering in the crossover from BEC to BCS. Our observations are compared with a mean field theory. Our system offers a new way to study competing orders in strongly correlated matter.

[1] K. Roux, H. Konishi, V. Helson, and J.-P. Brantut, “Strongly correlated Fermions strongly coupled to light,” Nat Commun, vol. 11, no. 1, p. 2974, Jun. 2020, doi: 10.1038/s41467-020-16767-8.
[2] K. Roux, V. Helson, H. Konishi, and J. P. Brantut, “Cavity-assisted preparation and detection of a unitary Fermi gas,” New J. Phys., vol. 23, no. 4, p. 043029, Apr. 2021, doi: 10.1088/1367-2630/abeb91.
[3] H. Konishi, K. Roux, V. Helson, and J.-P. Brantut, “Universal pair polaritons in a strongly interacting Fermi gas,” Nature, pp. 1–5, Aug. 2021, doi: 10.1038/s41586-021-03731-9.
[4] V. Helson, T. Zwettler, K. Roux, H. Konishi, S. Uchino, and J.-P. Brantut, “Optomechanical Response of a Strongly Interacting Fermi Gas,” arXiv:2111.02931 [cond-mat, physics:physics, physics:quant-ph], Nov. 2021, [Online]. Available: http://arxiv.org/abs/2111.02931

Presenter name Victor Helson

Primary authors

Mr Victor Helson (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne) Prof. Jean-Philippe Brantut (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne) Dr Giulia del Pace (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne) Mr Timo Zwettler (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne) Ms Tabea Bühler (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne)

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