Prediction and Observation of Universal Hall Responses in Strongly Interacting Fermions

DIPC Seminars

Speaker: Filippone Michele
CEA Grenoble
When: 2026/01/28
12:00
Place: DIPC Josebe Olarra Seminar Room
Host: Adolfo Grushin
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Prediction and Observation of Universal Hall Responses in Strongly Interacting Fermions

The Hall effect originates from the motion of charged particles in a magnetic field and has deep consequences for the description and characterization of materials, far beyond the context of condensed matter physics. Understanding the Hall effect in interacting systems still represents a fundamental challenge. In this seminar, I will discuss how such phenomenon can be investigated exploiting controllable quench dynamics in an atomic quantum simulators [1]. By tracking the motion of ultracold fermions in a two- and three-leg ribbon threaded by an artificial magnetic field, we measure the Hall response as a function of synthetic tunneling, atomic interactions and current carrier density n. I will discuss how such experiments unveil an interaction-independent universal behavior above an interaction threshold, in clear agreement with theoretical analyses [2-3]. I will then discuss how these experiments can also measure the Hall voltage [4-5], providing the first experimental demonstration of the RH ∝ 1/n scaling of the Hall constant in a strongly correlated quantum simulator.

[1] T. Zhou, D. Tusi, L. Franchi, J. Parravicini, C. Repellin, S. Greschner, M. Inguscio, G. Cappellini, T. Giamarchi, M. Filippone, J. Catani, L. Fallani, Observation of Universal Hall Response in Strongly Interacting Fermions, Science 381, 427 (2023)

[2] S. Greschner, M. Filippone and T. Giamarchi, Universal Hall Response in Interacting Quantum Systems, Phys. Rev. Lett. 122, 083402 (2019).

[3] M. Filippone, C.-E. Bardyn. S. Greschner and T. Giamarchi, Vanishing Hall Response of Charged Fermions in a Transverse Magnetic Field, Phys. Rev. Lett. 123, 086803 (2019).

[4] Maximilian Buser, Sebastian Greschner, Ulrich Schollwöck, and Thierry Giamarchi, Probing the Hall Voltage in Synthetic Quantum Systems, Phys. Rev. Lett. 126, 030501 (2021).

[5] T.-W. Zhou, T. Beller, G. Masini, J. Parravicini, G. Cappellini, C. Repellin, T. Giamarchi, J. Catani, M. Filippone, L. Fallani, Measuring Hall voltage and Hall resistance in an atom-based quantum simulator, Nat. Comm. 16, 10247 (2025)