Observation of Universal Hall Response in Strongly Interacting Fermions

• Main Authors: Zhou, T. -W, Cappellini, G, Tusi, D, Franchi, L, Parravicini, J, Repellin, C, Greschner, S, Inguscio, M, Giamarchi, T, Filippone, M, Catani, J, Fallani, L
• Format: Journal Article
• Language: English
• Published: 21-08-2023
• Subjects: Physics - Quantum Gases; Physics - Quantum Physics; Physics - Strongly Correlated Electrons
• DOI: 10.48550/arxiv.2205.13567

Science 381, 427-430 (2023). This is the author's version of the
work. It is posted here by permission of the AAAS for personal use, not for
redistribution. The definitive version was published in Science on 27 July
2023 The Hall effect, which originates from the motion of charged particles in
magnetic fields, has deep consequences for the description of materials,
extending far beyond condensed matter. Understanding such an effect in
interacting systems represents a fundamental challenge, even for small magnetic
fields. In this work, we used an atomic quantum simulator in which we tracked
the motion of ultracold fermions in two-leg ribbons threaded by artificial
magnetic fields. Through controllable quench dynamics, we measured the Hall
response for a range of synthetic tunneling and atomic interaction strengths.
We unveil a universal interaction-independent behavior above an interaction
threshold, in agreement with theoretical analyses. The ability to reach
hard-to-compute regimes demonstrates the power of quantum simulation to
describe strongly correlated topological states of matter.