"Many-body phases in dipolar atoms: novel quantum mixtures and supersolidity"

Who: Claudia Politi, Institute for Quantum Optics and Quantum Information, Innsbruck, Austria

Place: Donostia International Physics Center

Date: Friday, 10 February 2023, 12:00

In the past decades, ultracold atomic gases revealed to be an ideal platform for simulating quantum phenomena thanks to the ability to tune the inter-particle interactions, the geometry of the system, and the possibility of adding complexity in a controlled way. Recently, ultracold gases made of magnetic atoms brought the discovery of exotic states of matter arising from long-range and anisotropic dipole dipole interactions, such as liquid-like self-bound droplets and supersolid states [1]. 
In this talk, I will present the latest results from our dipolar quantum gas ex eriment, which combines the two highly magnetic atomic species, erbium and dysprosium, merging for the first time the field of hetero-nuclear mixtures with the one of ultracold dipolar gases. After the realization of dipolar quantum mixtures of erbium and dysprosium [2] and the investigation of their interspecies interactions [3,4], we proved supersolidity with dysprosium, a state combining the phase coherence of a superfluid with the spatial periodicity of a crystal.
By following the lifecycle of the supersolid state, we investigate the role that thermal fluctuations play in the development of density modulation [5]. Finally, we extend the supersolid properties from one to two dimensions [6], reaching circular supersolid states. This result paves the way for the study of vortices, persistent currents, and phases with exotic geometry.

[1] L. Chomaz, I. Ferrier-Barbut, F. Ferlaino, B. Laburthe- Tolra, B. L. Lev, and T. Pfau. Dipolar physics: A review of experiments with magnetic quantum gases. arXiv preprint arXiv:2201.02672, 2022
[2] A. Trautmann, P. Ilzh÷fer, G. Durastante, C. Politi, M. Sohmen, M. J. Mark, and F. Ferlaino, Dipolar Quantum Mixtures of Erbium and Dysprosium Atoms, Phys. Rev. Lett. 121, 213601 (2018).
[3] G. Durastante, C. Politi, M. Sohmen, P. Ilzh÷fer, M. J. Mark, M. A. Norcia, and F. Ferlaino, Feshbach resonances n an erbium-dysprosium dipolar mixture, Phys. Rev. A 102, 033330 (2020).
[4] C. Politi, A. Trautmann, P. Ilzh÷fer, G. Durastante, M. J. Mark, M. Modugno, and F. Ferlaino, Interspecies interactions in an ultracold dipolar mixture, Phys. Rev. A 105, 023304 (2022).[5] J. Sßnchez-Baena, C. Politi, F. Maucher, F. Ferlaino, and T. Pohl. Heating a quantum dipolar fluid into a solid. arXiv preprint 2209.00335, 2022[6] M. A. Norcia*, C. Politi*, L. Klaus, E. Poli, M. Sohmen, Manfred J. Mark, R. N. Bisset, L. Santos and F. Ferlaino, Two-dimensional supersolidity in a dipolar quantum gas. Nature 596, 357?361 (2021).

Host: Ricardo Diez Muino

Note: This lecture is part of the joint session with talk by Gabriele Natale scheduled at 12:30 p.m.

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