Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 1: Ultra-cold Atoms, Ions and BEC I (joint session A/Q)

Q 1.2: Talk

Monday, March 11, 2024, 11:30–11:45, HS 1010

Determination of the dissipative response of a circularly driven atomic erbium quantum Hall system — Franz Richard Huybrechts, •Arif Warsi Laskar, and Martin Weitz — Institut für Angewandte Physik der Universität Bonn

Cold atomic gases are attractive systems for the study of topological states and phases. Here we report on experimental work studying the dissipative response of a synthetic atomic erbium quantum Hall system to two different handed modes of circular shaking. In general, the dissipative response of a topological system, expressed by its circular dichroism, is linked to the transport properties by a Kramers-Kronig relation. In our experiment, for a cold cloud of erbium atoms a quantum Hall geometry is realised in a two-dimensional state space, consisting of one spatial and one synthetic dimension, with the latter being encoded in the Zeeman quantum number of erbium atoms in the ground state. Our measurements give evidence for a difference in the excitation rates between left and right handed driving. The current status of this ongoing experiment will be reported.

Keywords: Synthetic quantum Hall system; Circular dichroism; Erbium BEC; Synthetic gauge field