59 citations · 175 across the 6 of their papers we have counts for
6 papers
Fragility of topological invariant characterizing triplet excitations in a bilayer kagome magnet
Andreas Thomasen, Karlo Penc, Nic Shannon +1
The discovery by Kane and Mele of a model of spinful electrons characterized by a topological invariant had a lasting effect on the study of electronic band structu…
Topological states in the Kronig-Penney model with arbitrary scattering potentials
Irina Reshodko, Albert Benseny, Judit Romhányi +1
We use an exact solution to the fundamental finite Kronig-Penney model with arbitrary positions and strengths of scattering sites to show that this iconic model can possess topolog…
Direct observation of spin-quadrupolar excitations in SrCoGeO by high field ESR
Mitsuru Akaki, Daichi Yoshizawa, Akira Okutani +4
Exotic spin-multipolar ordering in spin transition metal insulators has so far eluded unambiguous experimental observation. A less studied, but perhaps more feasible fingerprint of…
Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance
Judit Romhányi, Guido Burkard, András Pályi
We theoretically study coherent subharmonic (multi-photon) transitions of a harmonically driven spin. We consider two cases: magnetic resonance (MR) with a misaligned, i.e., non-tr…
Entangled tetrahedron ground state and excitations of the magneto-electric skyrmion material CuOSeO
Judit Romhányi, Jeroen van den Brink, Ioannis Rousochatzakis
The strongly correlated cuprate CuOSeO has recently been identified as the first insulating system exhibiting a skyrmion lattice phase. Using a microscopic multi-boson theo…
Multiboson spin-wave theory for Ba2CoGe2O7, a spin-3/2 easy-plane Neel antiferromagnet with strong single-ion anisotropy
Judit Romhányi, Karlo Penc
We consider the square-lattice antiferromagnetic Heisenberg Hamiltonian extended with a single-ion axial anisotropy term as a minimal model for the multiferroic Ba2CoGe2O7. Develop…