Group seminar at LMU and Zoom: Prediction and Observation of the Universal Hall Response in Strongly Interacting Fermions
Prof. Michele Filippone, Université Grenoble
Group seminar at LMU seminar room and Zoom
Tuesday, November 14 at 09:00 am (MEZ)
Abstract: 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. Here  we directly observe the build-up of the Hall response in an interacting quantum system by exploiting controllable quench dynamics in an atomic quantum simulator, see Figure 1. By tracking the motion of ultracold fermions in a two-leg ribbon threaded by an artiﬁcial magnetic ﬁeld, we measure the Hall response as a function of synthetic tunnelling and atomic interactions. We unveil an interaction-independent universal behaviour above an interaction threshold, in clear agreement with theoretical analyses [2-3]. We will also discuss measurements of the Hall voltage. Our approach and ﬁndings open new directions for the quantum simulation of strongly correlated topological states of matter.
 T. Zhou, D. Tusi, L. Franchi, J. Parravicini, C. Repellin, S. Greschner, M. Inguscio, G. Cappellini,
T. Giamarchi, M. Filippone, J. Catani, L. Fallani, Science 381, 427 (2023)
 S. Greschner, M. Filippone and T. Giamarchi, Universal Hall Response in Interacting Quantum
Systems, Phys. Rev. Lett. 122, 083402 (2019).
 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)