536 citations · 3.4k across the 38 of their papers we have counts for
38 papers
Floquet-driven crossover from density-assisted tunneling to enhanced pair tunneling
Nick Klemmer, Janek Fleper, Valentin Jonas +4
We investigate the experimental control of pair tunneling in a double-well potential using Floquet engineering. We demonstrate a crossover from a regime with density-assisted tunne…
Exciting the Higgs mode in a strongly-interacting Fermi gas by interaction modulation
Andreas Kell, Moritz Breyer, Daniel Eberz +1
We study the Higgs mode of a strongly-interacting Fermi gas in the crossover regime between a fermionic and bosonic superfluid. By periodically modulating the interaction strength…
Coupled high-finesse optical Fabry-Perot microcavities
Steffen Gohlke, Thorsten Langerfeld, Andrea Bergschneider +1
Optical fiber Fabry-Perot cavities have been a development facilitating the efficient integration of high-finesse cavities into fiber-optic assemblies. In this work, we demonstrate…
Competing magnetic orders in a bilayer Hubbard model with ultracold atoms
Marcell Gall, Nicola Wurz, Jens Samland +2
Fermionic atoms in optical lattices have served as a compelling model system to study and emulate the physics of strongly-correlated matter. Driven by the advances of high-resoluti…
Machine-learning the phase diagram of a strongly-interacting Fermi gas
M. Link, K. Gao, A. Kell +4
We determine the phase diagram of strongly correlated fermions in the crossover from Bose-Einstein condensates of molecules (BEC) to Cooper pairs of fermions (BCS) utilizing an art…
Detecting the phase transition in a strongly-interacting Fermi gas by unsupervised machine learning
D. Eberz, M. Link, A. Kell +3
We study the critical temperature of the superfluid phase transition of strongly-interacting fermions in the crossover regime between a Bardeen-Cooper-Schrieffer (BCS) superconduct…
Radio-frequency driving of an attractive Fermi gas in a one-dimensional optical lattice
Johannes Kombe, Michael Köhl, Corinna Kollath +1
We investigate the response to radio-frequency driving of an ultracold gas of attractively interacting fermions in a one-dimensional optical lattice. We study the system dynamics b…
A compact and fast magnetic coil for the interaction manipulation of quantum gases with Feshbach resonances
A. Kell, M. Link, M. Breyer +3
Cold atom experiments commonly use broad magnetic Feshbach resonances to manipulate the interaction between atoms. In order to induce quantum dynamics by a change of the interactio…
Decay and revival of a transient trapped Fermi condensate
Timothy Harrison, Martin Link, Alexandra Behrle +6
We study experimentally and theoretically the response of a two-component Fermi condensate in the strongly-interacting regime to a quench of the interaction strength. The quench is…
Correlated photon-pair emission from a cw-pumped Fabry-Perot microcavity
Thorsten F. Langerfeld, Hendrik M. Meyer, Michael Köhl
We study a dispersion-compensated high-finesse optical Fabry-Perot microcavity under high-intensity cw pumping. The Kerr non-linearity in the optical coatings causes a spontaneous…
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…
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…
Monolayer graphene as dissipative membrane in an optical resonator
Hendrik M. Meyer, Moritz Breyer, Michael Köhl
We experimentally demonstrate coupling of an atomically thin, free-standing graphene membrane to an optical cavity. By changing the position of the membrane along the standing-wave…
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…
Equation of state of the two-dimensional Hubbard model
Eugenio Cocchi, Luke A. Miller, Jan H. Drewes +4
Understanding the phases of strongly correlated quantum matter is challenging because they arise from the subtle interplay between kinetic energy, interactions, and dimensionality.…
Relaxation dynamics of a Fermi gas in an optical superlattice
D. Pertot, A. Sheikhan, E. Cocchi +5
This paper comprises an experimental and theoretical investigation of the time evolution of a Fermi gas following fast and slow quenches of a one-dimensional optical double-well su…
Universal spin dynamics in two-dimensional Fermi gases
Marco Koschorreck, Daniel Pertot, Enrico Vogt +1
Harnessing spins as carriers for information has emerged as an elegant extension to the transport of electrical charges. The coherence of such spin transport in spintronic circuits…
Decoherence of a single-ion qubit immersed in a spin-polarized atomic bath
L. Ratschbacher, C. Sias, L. Carcagni +3
We report on the immersion of a spin-qubit encoded in a single trapped ion into a spin-polarized neutral atom environment, which possesses both continuous (motional) and discrete (…
Collective modes of a two-dimensional spin-1/2 Fermi gas in a harmonic trap
Stefan K. Baur, Enrico Vogt, Michael Köhl +1
We derive analytical expressions for the frequency and damping of the lowest collective modes of a two-dimensional Fermi gas using kinetic theory. For strong coupling, we furthermo…
A two-dimensional Fermi liquid with attractive interactions
B. Fröhlich, M. Feld, E. Vogt +4
We realize and study an attractively interacting two-dimensional Fermi liquid. Using momentum resolved photoemission spectroscopy, we measure the self-energy, determine the contact…
Controlling chemical reactions of a single particle
Lothar Ratschbacher, Christoph Zipkes, Carlo Sias +1
The control of chemical reactions is a recurring theme in physics and chemistry. Traditionally, chemical reactions have been investigated by tuning thermodynamic parameters, such a…
Attractive and repulsive Fermi polarons in two dimensions
Marco Koschorreck, Daniel Pertot, Enrico Vogt +3
The dynamics of a single impurity in an environment is a fundamental problem in many-body physics. In the solid state, a well-known case is an impurity coupled to a bosonic bath, f…
Laser spectroscopy and cooling of Yb+ ions on a deep-UV transition
Hendrik M. Meyer, Matthias Steiner, Lothar Ratschbacher +2
We perform laser spectroscopy of Yb+ ions on the 4f14 6s 2S_{1/2} - 4f13 5d 6s 3D[3/2]_{1/2} transition at 297 nm. The frequency measurements for 170Yb+, 172Yb+, 174Yb+, and 176Yb+…