6 papers
Phases of Quasi-One-Dimensional Fractional Quantum (Anomalous) Hall - Superconductor Heterostructures
Steffen Bollmann, Andreas Haller, Jukka I. Väyrynen +2
Motivated by recent observations of fractional Chern insulators (FCIs) in the vicinity of superconducting (SC) phases, we study fractional quantum (anomalous) Hall-superconductor h…
Regularized Micromagnetic Theory for Bloch Points
Vladyslav M. Kuchkin, Andreas Haller, Andreas Michels +2
Magnetic singularities known as Bloch points (BPs) present a fundamental challenge for micromagnetic theory, which is based on the assumption of a fixed magnetization vector length…
Skyrmionic Schrödinger cat states in monoaxial chiral magnets
Stefan Liscak, Andreas Haller, Andreas Michels +2
We study the low-energy excitation spectra of a spin-1/2 quantum Heisenberg model with a monoaxial Dzyaloshinskii-Moriya interaction. Using the density matrix renormalization group…
Spin-disorder-induced angular anisotropy in polarized magnetic neutron scattering
I. Titov, M. Bersweiler, M. P. Adams +14
We experimentally report a hitherto unseen angular anisotropy in the polarized small-angle neutron scattering (SANS) cross section of a magnetically strongly inhomogeneous material…
Quantum geometry in the dynamics of band-projected operators
Chen Xu, Andreas Haller, Suraj Hegde +2
We study the dynamics of electrons in crystalline solids in the presence of inhomogeneous external electric and magnetic fields. We present a manifestly gauge-invariant operator-ba…
Stability and Nucleation of Dipole Strings in Uniaxial Chiral Magnets
Vladyslav M. Kuchkin, Nikolai S. Kiselev, Andreas Haller +3
We report on the stability of the magnetic dipole string (DS), a three-dimensional magnetic texture formed by two coupled Bloch points with opposite topological charges, separated…