High-precision multiband spectroscopy of ultracold fermions in a nonseparable optical lattice

Abstract

Spectroscopic tools are fundamental for the understanding of complex quantum systems. Here we demonstrate high-precision multi-band spectroscopy in a graphene-like lattice using ultracold fermionic atoms. From the measured band structure, we characterize the underlying lattice potential with a relative error of 1.2 10^(-3). Such a precise characterization of complex lattice potentials is an important step towards precision measurements of quantum many-body systems. Furthermore, we explain the excitation strengths into the different bands with a model and experimentally study their dependency on the symmetry of the perturbation operator. This insight suggests the excitation strengths as a suitable observable for interaction effects on the eigenstates.

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Cited by in corpus (15)

• Uncover Topology by Quantum Quench Dynamics
• Measuring quantized circular dichroism in ultracold topological matter
• Extracting the quantum metric tensor through periodic driving
• Floquet dynamics in driven Fermi-Hubbard systems
• Suppressing dissipation in a Floquet-Hubbard system
• Floquet engineering of individual band gaps in an optical lattice using a two-tone drive
• Quantized Rabi Oscillations and Circular Dichroism in Quantum Hall Systems
• Resonant excitations of a Bose Einstein condensate in an optical lattice
• Multi-frequency optical lattice for dynamic lattice-geometry control
• Tensor monopoles and negative magnetoresistance effect in optical lattices
• Designs of magnetic atom-trap lattices for quantum simulation experiments
• Topologically nontrivial and trivial flat bands via weak and strong interlayer coupling in twisted bilayer honeycomb optical lattices for ultracold atoms
• Fast and selective inter-band transfer of ultracold atoms in bichromatic lattices permitting Dirac points
• Loading ultracold atoms onto nonlinear Bloch states and soliton states in bichromatic lattices
• Direct reconstruction of the band structure of a 1D optical lattice with thermal atoms