Nick Fläschner
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Shape-constrained deformable brain segmentation: Methods and quantitative validation Open
MRI-guided neuro interventions require rapid, accurate, and reproducible segmentation of anatomical brain structures for identification of targets during surgical procedures and post-surgical evaluation of intervention efficiency. Segmenta…
High-precision multiband spectroscopy of ultracold fermions in a nonseparable optical lattice Open
Spectroscopic tools are fundamental for the understanding of complex quantum\nsystems. Here we demonstrate high-precision multi-band spectroscopy in a\ngraphene-like lattice using ultracold fermionic atoms. From the measured band\nstructur…
High precision spectroscopy of ultracold atoms in optical lattices Open
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 ultracold fermionic atoms. From the measured band structure, …
Characterizing topology by dynamics: Chern number from linking number Open
Topology plays an important role in modern solid state physics describing intriguing quantum states such as topological insulators. It is an intrinsically non-local property and therefore challenging to access, often studied only via the r…
View article: Observation of Topological Bloch-State Defects and Their Merging Transition
Observation of Topological Bloch-State Defects and Their Merging Transition Open
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. Such defects can arise in systems with a two-atomic basis du…
Observation of a dynamical topological phase transition Open
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 well-established in equilibrium, similarly fundamental concep…
View article: Experimental reconstruction of the Berry curvature in a Floquet Bloch band
Experimental reconstruction of the Berry curvature in a Floquet Bloch band Open
Cold atoms do geometry Electrons in solids populate energy bands, which can be simulated in cold atom systems using optical lattices. The geometry of the corresponding wave functions determines the topological properties of the system, but…