623 citations · 1.9k across the 16 of their papers we have counts for
16 papers
Ultrafast many-body dynamics of dense Rydberg gases and ultracold plasma
Mario Großmann, Jette Heyer, Julian Fiedler +4
Understanding Coulomb driven many-body dynamics in ultracold atomic systems far from equilibrium remains an open challenge, particularly when ultrafast excitation channels create c…
Cooling dynamics of a free ion in a Bose-Einstein condensate
Lorenzo Oghittu, Juliette Simonet, Philipp Wessels-Staarmann +4
We investigate the dynamics of an ion moving through a homogeneous Bose-Einstein condensate (BEC) after an initial momentum is imparted. For this, we derive a master equation in th…
Tailoring quantum gases by Floquet engineering
Christof Weitenberg, Juliette Simonet
Floquet engineering is the concept of tailoring a system by a periodic drive. It has been very successful in opening new classes of Hamiltonians to the study with ultracold atoms i…
Ultrafast Electron Cooling in an Expanding Ultracold Plasma
Tobias Kroker, Mario Großmann, Klaus Sengstock +3
Plasma dynamics critically depends on density and temperature, thus well-controlled experimental realizations are essential benchmarks for theoretical models. The formation of an u…
Absolute strong-field ionization probabilities of ultracold rubidium atoms
Philipp Wessels, Bernhard Ruff, Tobias Kroker +5
We report on precise measurements of absolute nonlinear ionization probabilities obtained by exposing optically trapped ultracold rubidium atoms to the field of an ultrashort laser…
Modified spin-wave theory and spin liquid behavior of cold bosons on an inhomogeneous triangular lattice
Alessio Celi, Tobias Grass, Andrew J. Ferris +5
Ultracold bosons in a triangular lattice are a promising candidate for observing quantum spin liquid behavior. Here we investigate, for such system, the role of a harmonic trap giv…
Symmetry-broken momentum distributions induced by matter-wave diffraction during time-of-flight expansion of ultracold atoms
Malte Weinberg, Ole Jürgensen, Christoph Ölschläger +3
We study several effects which lead to symmetry-broken momentum distributions of quantum gases released from optical lattices. In particular, we demonstrate that interaction within…
Breaking inversion symmetry in a state-dependent honeycomb lattice: Artificial graphene with tunable band gap
Malte Weinberg, Christina Staarmann, Christoph Ölschläger +2
Here, we present the application of a novel method for controlling the geometry of a state-dependent honeycomb lattice: The energy offset between the two sublattices of the honeyco…
Multiphoton interband excitations of quantum gases in driven optical lattices
M. Weinberg, C. Ölschläger, C. Sträter +4
We report on the observation of multiphoton interband absorption processes for quantum gases in shaken light crystals. Periodic inertial forcing, induced by a spatial motion of the…
Spin Orbit Coupling in Periodically Driven Optical Lattices
Julian Struck, Juliette Simonet, Klaus Sengstock
We propose a method for the emulation of artificial spin orbit coupling in a system of ultracold, neutral atoms trapped in a tight-binding lattice. This scheme does not involve nea…
Beyond mean-field study of a binary bosonic mixture in a state-dependent honeycomb lattice
Lushuai Cao, Sven Krönke, Jan Stockhofe +4
We investigate a binary mixture of bosonic atoms loaded into a state-dependent honeycomb lattice. For this system, the emergence of a so-called twisted-superfluid ground state was…
Quantum phases in tunable state-dependent hexagonal optical lattices
Dirk-Sören Lühmann, Ole Jürgensen, Malte Weinberg +3
We study the ground-state properties of ultracold bosonic atoms in a state-dependent graphene-like honeycomb optical lattice, where the degeneracy between the two triangular sublat…
Engineering Ising-XY spin models in a triangular lattice via tunable artificial gauge fields
Julian Struck, Malte Weinberg, Christoph Ölschläger +8
Emulation of gauge fields for ultracold atoms provides access to a class of exotic states arising in strong magnetic fields. Here we report on the experimental realisation of tunab…
Non-Abelian gauge fields and topological insulators in shaken optical lattices
Philipp Hauke, Olivier Tieleman, Alessio Celi +8
Time-periodic driving like lattice shaking offers a low-demanding method to generate artificial gauge fields in optical lattices. We identify the relevant symmetries that have to b…
Tunable gauge potential for neutral and spinless particles in driven lattices
Julian Struck, Christoph Ölschläger, Malte Weinberg +6
We present a universal method to create a tunable, artificial vector gauge potential for neutral particles trapped in an optical lattice. The necessary Peierls phase of the hopping…
Frequency metrology in quantum degenerate helium: Direct measurement of the 2 3S1 - 2 1S0 transition
R. van Rooij, J. S. Borbely, J. Simonet +4
Precision spectroscopy of simple atomic systems has refined our understanding of the fundamental laws of quantum physics. In particular, helium spectroscopy has played a crucial ro…