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20 papers
Coherent Manipulation of Spin Correlations in the Hubbard Model
N. Wurz, C. F. Chan, M. Gall +6
We coherently manipulate spin correlations in a two-component atomic Fermi gas loaded into an optical lattice using spatially and time-resolved Ramsey spectroscopy combined with hi…
Measuring entropy and mutual information in the two-dimensional Hubbard model
E. Cocchi, L. A. Miller, J. H. Drewes +4
We measure pressure and entropy of ultracold fermionic atoms in an optical lattice for a range of interaction strengths, temperatures and fillings. Our measurements demonstrate tha…
Cavity-induced generation of non-trivial topological states in a two-dimensional Fermi gas
Ameneh Sheikhan, Ferdinand Brennecke, Corinna Kollath
We propose how topologically non-trivial states can dynamically organize in a fermionic quantum gas which is confined to a two-dimensional optical lattice potential and coupled to…
Antiferromagnetic correlations in two-dimensional fermionic Mott-insulating and metallic phases
J. H. Drewes, L. A. Miller, E. Cocchi +4
Near zero temperature, quantum magnetism can non-trivially arise from short-range interactions, but the occurrence of magnetic order depends crucially on the interplay of interacti…
Thermodynamics vs. local density fluctuations in the metal/Mott-insulator crossover
J. H. Drewes, E. Cocchi, L. A. Miller +4
The crossover between a metal and a Mott insulator leads to a localization of fermions from delocalized Bloch states to localized states. We experimentally study this crossover usi…
Magnetic noise spectrum measurement by an atom laser in gravity
O. Kálmán, Z. Darázs, F. Brennecke +1
Bose-Einstein condensates of ultracold atoms can be used to sense fluctuations of the magnetic field by means of transitions into untrapped hyperfine states. It has been shown rece…