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Site-selective preparation of two-dimensional dipolar quantum gases in an optical beat-note lattice
Niclas Höllrigl, Marian Kreyer, Rudolf Grimm +1
High-resolution microscopy of two-dimensional dipolar quantum gases requires selecting individual atomic layers, a task complicated for strongly magnetic lanthanide atoms by the li…
Optically trapped Feshbach molecules of fermionic Dy and K: Role of light-induced and collisional losses
Alberto Canali, Chun-Kit Wong, Luc Absil +4
We study the decay of a dense, ultracold sample of weakly bound DyK dimers stored in an optical dipole trap. Our bosonic dimers are composed of the fermionic isotopes Dy an…
Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
Zhu-Xiong Ye, Alberto Canali, Chun-Kit Wong +3
Ultracold quantum-gas mixtures of fermionic atoms with resonant control of interactions offer a unique test-bed to explore few- and many-body quantum states with unconventional pro…
Mediated interactions between Fermi polarons and the role of impurity quantum statistics
Cosetta Baroni, Bo Huang, Isabella Fritsche +7
The notion of quasi-particles is essential for understanding the behaviour of complex many-body systems. A prototypical example of a quasi-particle, a polaron, is an impurity stron…
Comprehensive characterization of an apparatus for cold electromagnetic dysprosium dipoles
Gregor Anich, Niclas Höllrigl, Marian Kreyer +2
We report on the development of an advanced ultracold dysprosium apparatus, which incorporates a cold atom microscope (CAM) with a design resolution of a quarter micrometer. The CA…
Optically trapped Feshbach molecules of fermionic 161Dy and 40K
E. Soave, A. Canali, Zhu-Xiong Ye +3
We report on the preparation of a pure ultracold sample of bosonic DyK Feshbach molecules, which are composed of the fermionic isotopes 161Dy and 40K. Employing a magnetic sweep ac…
Observation of low-field Feshbach resonances between Dy and K
Zhu-Xiong Ye, Alberto Canali, Elisa Soave +5
We report on the observation of Feshbach resonances at low magnetic field strength (below 10 G) in the Fermi-Fermi mixture of Dy and K. We characterize five resonanc…
Low-field Feshbach resonances and three-body losses in a fermionic quantum gas of Dy
Elisa Soave, Vincent Corre, Cornelis Ravensbergen +4
We report on high-resolution Feshbach spectroscopy on a degenerate, spin-polarized Fermi gas of Dy atoms, measuring three-body recombination losses at low magnetic field. F…
Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture
Isabella Fritsche, Cosetta Baroni, Erich Dobler +5
We investigate the properties of a strongly interacting imbalanced mixture of bosonic K impurities immersed in a Fermi sea of ultracold Li atoms. This enables us to expl…
Breathing Mode of a BEC Repulsively Interacting with a Fermionic Reservoir
Bo Huang, Isabella Fritsche, Rianne S. Lous +4
We investigate the fundamental breathing mode of a small-sized elongated Bose-Einstein condensate coupled to a large Fermi sea of atoms. Our observations show a dramatic shift of t…
Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms
Cornelis Ravensbergen, Vincent Corre, Elisa Soave +3
We report on the realization of a mixture of fermionic Dy and fermionic K where both species are deep in the quantum-degenerate regime. Both components are spin-pola…
Observation of interspecies Feshbach resonances in an ultracold K-Cs mixture and refinement of interaction potentials
Michael Gröbner, Philipp Weinmann, Emil Kirilov +4
We observe interspecies Feshbach resonances due to s-wave bound states in ultracold K-Cs scattering for three different spin mixtures. The resonances are observed as…
Degenerate Raman sideband cooling of 39K
Michael Gröbner, Philipp Weinmann, Emil Kirilov +1
We report on the first realization of sub-Doppler laser cooling of 39K atoms using degenerate 3D Raman sideband cooling. We take advantage of the well-resolved excited hyperfine st…
Bloch oscillations in the absence of a lattice
Florian Meinert, Michael Knap, Emil Kirilov +4
We experimentally investigate the quantum motion of an impurity atom that is immersed in a strongly interacting one-dimensional Bose liquid and is subject to an external force. We…
A new quantum gas apparatus for ultracold mixtures of K and Cs and KCs ground-state molecules
Michael Gröbner, Philipp Weinmann, Florian Meinert +3
We present a new quantum gas apparatus for ultracold mixtures of K and Cs atoms and ultracold samples of KCs ground-state molecules. We demonstrate the apparatus' capabilities by p…
Compact, robust, and spectrally pure diode-laser system with a filtered output and a tunable copy for absolute referencing
Emil Kirilov, Manfred J. Mark, Maximilian Segl +1
We report on a design of a compact laser system composed of an extended cavity diode laser with high passive stability and a pre-filter Fabri-Perot cavity. The laser is frequency s…
Observation of many-body long-range tunneling after a quantum quench
Florian Meinert, Manfred J. Mark, Emil Kirilov +5
Quantum tunneling constitutes one of the most fundamental processes in nature. We observe resonantly-enhanced long-range quantum tunneling in one-dimensional Mott-insulating Hubbar…
Interaction-induced quantum phase revivals and evidence for the transition to the quantum chaotic regime in 1D atomic Bloch oscillations
Florian Meinert, Manfred J. Mark, Emil Kirilov +4
We study atomic Bloch oscillations in an ensemble of one-dimensional tilted superfluids in the Bose-Hubbard regime. For large values of the tilt, we observe interaction-induced coh…
Quantum quench in an atomic one-dimensional Ising chain
Florian Meinert, Manfred J. Mark, Emil Kirilov +4
We study non-equilibrium dynamics for an ensemble of tilted one-dimensional atomic Bose-Hubbard chains after a sudden quench to the vicinity of the transition point of the Ising pa…