High-precision multiband spectroscopy of ultracold fermions in a nonseparable optical lattice
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 relat...
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| creator | Fläschner, Nick Tarnowski, Matthias Rem, Benno S Vogel, Dominik Sengstock, Klaus Weitenberg, Christof |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.1801.05614 |
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| ispartof | arXiv.org, 2018-05 |
| issn | 2331-8422 |
| language | eng |
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| source | Freely Accessible Journals; arXiv.org |
| subjects | Dependence Eigenvectors Excitation Fermions Graphene Optical lattices Physics - Atomic Physics Physics - Quantum Gases Physics - Quantum Physics Spectrum analysis |
| title | High-precision multiband spectroscopy of ultracold fermions in a nonseparable optical lattice |
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