Publications (9)
Observation of supersolid-like sound modes in a driven quantum gas
Nikolas Liebster, Marius Sparn, Elinor Kath +3
Driven systems are of fundamental scientific interest, as they can exhibit properties that are radically different from the same system at equilibrium. In certain cases, long-lived…
Quantum field simulator for dynamics in curved spacetime
Celia Viermann, Marius Sparn, Nikolas Liebster +9
The observed large-scale structure in our Universe is seen as a result of quantum fluctuations amplified by spacetime evolution. This, and related problems in cosmology, asks for a…
Observation of pattern stabilization in a driven superfluid
Nikolas Liebster, Marius Sparn, Elinor Kath +6
The formation of patterns in driven systems has been studied extensively, and their emergence can be connected to a fine balance of instabilities and stabilization mechanisms. Whil…
Cosmological particle production in a quantum field simulator as a quantum mechanical scattering problem
Christian F. Schmidt, Ãlvaro Parra-López, Mireia Tolosa-Simeón +7
The production of quantum field excitations or particles in cosmological spacetimes is a hallmark prediction of curved quantum field theory. The generation of cosmological perturba…
Bose Einstein condensate as nonlinear block of a Machine Learning pipeline
Maurus Hans, Elinor Kath, Marius Sparn +5
Physical systems can be used as an information processing substrate and with that extend traditional computing architectures. For such an application the experimental platform must…
Curved and expanding spacetime geometries in Bose-Einstein condensates
Mireia Tolosa-Simeón, Ãlvaro Parra-López, Natalia Sánchez-Kuntz +9
Phonons have the characteristic linear dispersion relation of massless relativistic particles. They arise as low energy excitations of Bose-Einstein condensates and, in nonhomogene…
Experimental particle production in time-dependent spacetimes: a one-dimensional scattering problem
Marius Sparn, Elinor Kath, Nikolas Liebster +7
We experimentally study cosmological particle production in a two-dimensional Bose-Einstein condensate, whose density excitations map to an analog cosmology. The expansion of space…
Stable-fixed-point description of square-pattern formation in driven two-dimensional Bose-Einstein condensates
Keisuke Fujii, Sarah L. Görlitz, Nikolas Liebster +5
We investigate pattern formation in two-dimensional Bose-Einstein condensates (BECs) caused by periodic driving of the interatomic interaction. We show that this modulation generic…
High signal to noise absorption imaging of alkali atoms at moderate magnetic fields
Maurus Hans, Finn Schmutte, Celia Viermann +4
We present an improved scheme for absorption imaging of alkali atoms at moderate magnetic fields, where the excited state is well in the Paschen-Back regime but the ground state hy…