487 citations · 1.3k across the 10 of their papers we have counts for
10 papers
High-precision multiband spectroscopy of ultracold fermions in a nonseparable optical lattice
Nick Fläschner, Matthias Tarnowski, Benno S. Rem +3
Spectroscopic tools are fundamental for the understanding of complex quantum systems. Here we demonstrate high-precision multi-band spectroscopy in a graphene-like lattice using ul…
Measuring topology by dynamics: Chern number from linking number
Matthias Tarnowski, F. Nur Ünal, Nick Fläschner +4
Integer-valued topological indices, characterizing nonlocal properties of quantum states of matter, are known to directly predict robust physical properties of equilibrium systems.…
Observation of topological Bloch-state defects and their merging transition
Matthias Tarnowski, Marlon Nuske, Nick Fläschner +6
Topological defects in Bloch bands, such as Dirac points in graphene, and their resulting Berry phases play an important role for the electronic dynamics in solid state crystals. S…
Investigation of Feshbach Resonances in ultra-cold 40 K spin mixtures
Jasper S. Krauser, Jannes Heinze, S. Götze +7
Magnetically-tunable Feshbach resonances are an indispensable tool for experiments with atomic quantum gases. We report on twenty thus far unpublished Feshbach resonances and twent…
Observation of a dynamical topological phase transition
Nick Fläschner, Dominik Vogel, Matthias Tarnowski +7
Phase transitions are a fundamental concept in science describing diverse phenomena ranging from, e.g., the freezing of water to Bose-Einstein condensation. While the concept is we…
Experimental reconstruction of the Berry curvature in a topological Bloch band
N. Fläschner, B. S. Rem, M. Tarnowski +4
Topological properties lie at the heart of many fascinating phenomena in solid state systems such as quantum Hall systems or Chern insulators. The topology can be captured by the d…
Relaxation dynamics of an isolated large-spin Fermi gas far from equilibrium
Ulrich Ebling, Jasper Simon Krauser, Nick Fläschner +4
A fundamental question in many-body physics is how closed quantum systems reach equilibrium. We address this question experimentally and theoretically in an ultracold large-spin Fe…
Engineering spin waves in a high-spin ultracold Fermi gas
Jannes Heinze, Jasper Simon Krauser, Nick Fläschner +5
We report on the detailed study of multi-component spin-waves in an s=3/2 Fermi gas where the high spin leads to novel tensorial degrees of freedom compared to s = 1/2 systems. The…
Coherent multi-flavour spin dynamics in a fermionic quantum gas
Jasper Simon Krauser, Jannes Heinze, Nick Fläschner +3
Microscopic spin interaction processes are fundamental for global static and dynamical magnetic properties of many-body systems. Quantum gases as pure and well isolated systems off…
Multi-band spectroscopy of ultracold fermions: Observation of reduced tunneling in attractive Bose-Fermi mixtures
J. Heinze, S. Götze, J. S. Krauser +5
We perform a detailed experimental study of the band excitations and tunneling properties of ultracold fermions in optical lattices. Employing a novel multi-band spectroscopy for f…