Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Gases I

Q 20.7: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

Comparing Interacting and Non-Interacting Fermions in Topological Synthetic Ladder Systems — •Marcel Diem^1,2, Koen Sponselee^1,2, Benjamin Abeln^1,2, Nejira Pintul^1,2, Tobias Petersen^1,2, Klaus Sengstock^1,2, and Christoph Becker^1,2 — ¹Center for Optical Quantum Technologies, University of Hamburg, Hamburg, Germany — ²Institute for Laser Physics, University of Hamburg, Hamburg, Germany

Ultracold quantum gases of neutral atoms have been established as an excellent platform for quantum simulation including non-trivial topological systems due their ability to invoke artificial gauge fields and mimic the physics of charged particles in strong magnetic fields.

Here, we present experimental results on two ultracold fermionic ytterbium isotopes in topologically non-trivial lattices. One isotope, ¹⁷¹Yb, is non-interacting, whereas the isotope ¹⁷³Yb interacts repulsively. We study their behavior in synthetic two-dimensional ladder systems, comprised of a 1D lattice in real space, and a synthetic dimension spanned by two m_F states coupled by Raman beams.

In these ladder systems, the Raman beams impart momentum on the atoms, which results in a coupling between the spin and orbit degrees of freedom, analogous to the effect of a real magnetic field on charged particles.

We measure chiral edge currents and compare interacting and non-interacting systems. Our work paves the way towards a better understanding of the effect of interactions in non-trivial topological systems.

This work has been supported by the DPG within SFB 925.