Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Ultracold Matter (Bosons) II (joint session Q/A)

Q 22.1: Talk

Tuesday, March 11, 2025, 11:00–11:15, HS I PI

Exploring Frustration Effects of Strongly Interacting Bosons via the Hall Response — •Catalin-Mihai Halati and Thierry Giamarchi — Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland

We investigate the Hall response of interacting bosonic atoms on a triangular ladder in a magnetic field, making inroads in understanding the meaning of the Hall response for many-body quantum phases, by analyzing the effects of frustration effects and phase transitions. We show that the nature of the underlying chiral phases has an important influence on the behavior of the Hall polarization, both in its saturation value and in the short-time dynamics. In particular, we find correlations between the Hall response and the features of the underlying phase diagram stemming from the interplay of interactions and geometric frustration. Thus, one can employ the Hall response as a sensitive probe of the many-body chiral quantum phases present in the system.

Keywords: Bose-Hubbard model; Artificial magnetic fields; Triangular ladders; Frustration; Hall effect