Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 33: Poster VI

A 33.7: Poster

Thursday, March 14, 2024, 17:00–19:00, Tent A

Variable Multiphoton Lattices for Ultracold Rubidium Atoms — •Stefanie Moll¹, Geram Hunanyan¹, Johannes Koch¹, Enrique Rico^2,3,4,5, Enrique Solano⁶, and Martin Weitz¹ — ¹Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115 Bonn, Germany — ²Department of Physical Chemistry, University of the Basque Country UPV/EHU, Box 644, 48080 Bilbao, Spain — ³Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain — ⁴EHU Quantum Center, University of the Basque Country UPV/EHU, P.O. Box 644, 48080 Bilbao, Spain — ⁵IKERBASQUE, Basque Foundation for Science, Plaza Euskadi 5, 48009 Bilbao, Spain — ⁶Kipu Quantum, Greifswalder Straße 226, 10405 Berlin, Germany

Optical lattices are versatile tools to confine atoms in tuneable periodic potentials, with applications ranging from quantum simulation to the realization of atomic clocks. Usual standing wave lattices are realized by utilizing the ac Stark shift induced by red detuned standing waves to trap cold atoms in the antinodes of the periodic intensity pattern. In a quantum picture the induced potential arises due to virtual two-photon processes. We are exploring lattice potentials created by the dispersion of multiphoton Raman processes, which allows to achieve higher spatial periodicities as well as a state-dependency of the lattice potential. Using a four-photon lattice potential to create a suitable Bloch-band structure, we have performed a quantum simulation of the quantum Rabi model. We are currently exploring the applicability of multiphoton lattices to synthesize a larger variability of potentials.

Keywords: Bose-Einstein condensate; Rubidium; Optical Lattices