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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Bibliographic Details
Published in:arXiv.org 2018-05
Main Authors: Fläschner, Nick, Tarnowski, Matthias, Rem, Benno S, Vogel, Dominik, Sengstock, Klaus, Weitenberg, Christof
Format: Article
Language:English
Subjects:
Dependence
Eigenvectors
Excitation
Fermions
Graphene
Optical lattices
Spectrum analysis
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1801.05614