4.6 Article

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

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PHYSICAL REVIEW A
卷 97, 期 5, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.97.051601

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  1. Deutsche Forschungsgemeinschaft via the Research Unit [FOR 2414]
  2. excellence cluster The Hamburg Centre for Ultrafast Imaging - Structure, Dynamics and Control of Matter at the Atomic Scale
  3. European Commission (Marie Curie Fellowship)

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Spectroscopic tools are fundamental for the understanding of complex quantum systems. Here, we demonstrate high-precision multiband spectroscopy in a graphenelike lattice using ultracold fermionic atoms. From the measured band structure, we characterize the underlying lattice potential with a relative error of 1.2 x 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 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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