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Pfaffian invariant identifies magnetic obstructed atomic insulators
Isidora Araya Day, Anastasiia Varentcova, Daniel Varjas +1
We derive a topological invariant that extends beyond symmetry eigenvalues and Wilson loops and classifies two-dimensional insulators with a symmet…
Impact of disorder on the distribution of gate coupling strengths in a spin qubit device
Sathish R. Kuppuswamy, Hugo Kerstens, Chun-Xiao Liu +2
A scalable spin-based quantum processor requires a suitable semiconductor heterostructure and a gate design, with multiple alternatives being investigated. Characterizing such devi…
Breathing mode in open-orbit magnetotransport: a magnetic lens with a quantum mechanical focal length
D. O. Oriekhov, T. T. Osterholt, T. Vakhtel +2
We consider the propagation of electrons in a lattice with an anisotropic dispersion in the -- plane (lattice constant ), such that it supports open orbits along the -a…
Greedy optimization of the geometry of Majorana Josephson junctions
André Melo, Tanko Tanev, Anton R. Akhmerov
Josephson junctions in a two-dimensional electron gas with spin-orbit coupling are a promising candidate to realize topological superconductivity. While it is known that the geomet…
Topological defects in a double-mirror quadrupole insulator displace diverging charge
Isidora Araya Day, Anton R. Akhmerov, Daniel Varjas
We show that topological defects in quadrupole insulators do not host quantized fractional charges, contrary to what their Wannier representation indicates. In particular, we test…