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Non-periodic Boundary Conditions for Euler Class and Dynamical Signatures of Obstruction
Osama A. Alsaiari, Adrien Bouhon, Robert-Jan Slager +1
While the landscape of free-fermion phases has drastically been expanded in the last decades, recently novel multi-gap topological phases were proposed where groups of bands can ac…
Interferometry of non-Abelian band singularities and Euler class topology
Oliver Breach, Robert-Jan Slager, F. Nur Ünal
In systems with a real Bloch Hamiltonian band nodes can be characterised by a non-Abelian frame-rotation charge. The ability of these band nodes to annihilate pairwise is path depe…
Topological Euler class as a dynamical observable in optical lattices
F. Nur Ünal, Adrien Bouhon, Robert-Jan Slager
The last years have witnessed rapid progress in the topological characterization of out-of-equilibrium systems. We report on robust signatures of a new type of topology -- the Eule…
Hopf characterization of two-dimensional Floquet topological insulators
F. Nur Ünal, André Eckardt, Robert-Jan Slager
We present a topological characterization of time-periodically driven two-band models in 2+1 dimensions as Hopf insulators. The intrinsic periodicity of the Floquet system with res…