Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Ultra-cold atoms, ions and BEC IV (joint session A/Q)
Q 59.6: Vortrag
Donnerstag, 13. März 2025, 15:45–16:00, GrHS Mathe
Engineering tunable synthetic fluxes with Raman-coupled Bose mixtures in an accordion optical lattice — •Andreas Michael Meyer1, Ignacio Pérez-Ramos1, Rémy Vatré1, Sarah Hirthe1, and Leticia Tarruell1,2 — 1ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain — 2ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
The Harper-Hofstadter model describes two-dimensional charged particles in a lattice in a perpendicular magnetic field. For interacting particles, it features exotic phases like the lattice analog of the fractional quantum Hall states. So far, realizations of these strongly-interacting systems using neutral cold atoms have been limited to few particles.
We report on our progress towards an interacting many-body realization of the Harper-Hofstadter model. It is based on a Raman-coupled bosonic spin mixture where the two spin states can be thought of as lattice sites in a synthetic dimension. Placing the spin mixture in a one-dimensional optical lattice, we can obtain a ladder system and realize a minimal instance of the model. The Raman coupling further results in complex tunneling rates giving rise to a synthetic flux through the ladder. It is governed by two competing length scales: the lattice spacing and the wavelength of the recoil momentum of the Raman transition.
Here, we present our experiment with optical lattices of adjustable lattice spacing. We can thus realize ladder systems pierced by arbitrary fluxes and probe their spectrum using spin-injection techniques.
Keywords: synthetic gauge fields; optical lattices; spin mixtures; quantum Hall effect