158 citations · 487 across the 9 of their papers we have counts for
9 papers
Multipolar edge states in the breathing kagome model
Judit Romhányi
Excitations of ordered insulating magnets gain renewed interest due to their potential topological properties and the natural realization of magnetic analogues of the celebrated to…
Magnetoelectric memory function with optical readout
Vilmos Kocsis, Karlo Penc, Toomas Rõõm +8
The ultimate goal of multiferroic research is the development of new-generation non-volatile memory devices, the so-called magnetoelectric (ME) memories, where magnetic bits are co…
Spin-Orbit Dimers and Non-Collinear Phases in Cubic Double Perovskites
Judit Romhányi, Leon Balents, George Jackeli
We formulate and study a spin-orbital model for a family of cubic double perovskites with ions occupying a frustrated fcc sublattice. A variational approach and a complimenta…
Orbital reconstruction in nonpolar tetravalent transition-metal oxide layers
Nikolay A. Bogdanov, Vamshi M. Katukuri, Judit Romhányi +5
A promising route to tailoring the electronic properties of quantum materials and devices rests on the idea of orbital engineering in multilayered oxide heterostructures. Here we s…
Magnon spectrum of the helimagnetic insulator Cu2OSeO3
P. Y. Portnichenko, J. Romhanyi, Y. A. Onykiienko +11
Complex low-temperature ordered states in chiral magnets are typically governed by a competition between multiple magnetic interactions. The chiral-lattice multiferroic Cu2OSeO3 be…
Hall effect of triplons in a dimerized quantum magnet
Judit Romhányi, Karlo Penc, R. Ganesh
The celebrated Shastry Sutherland model has a gapped dimer singlet ground state. The material SrCu(BO) serves as a good realization of this model, upto small anisotropi…
Zero and finite temperature mean field study of magnetic field induced electric polarization in Ba2CoGe2O7
Judit Romhanyi, Miklos Lajko, Karlo Penc
We investigate the spin-induced polarization in the multiferroic compound Ba2CuGe2O7 using variarional and finite temperature mean field approaches. The compound is described by a…
Supersolid phase and magnetization plateaus observed in anisotropic spin-3/2 Heisenberg model on bipartite lattices
Judit Romhanyi, Frank Pollmann, Karlo Penc
We study the spin-3/2 Heisenberg model including easy-plane and exchange anisotropies in one and two dimensions. In the Ising limit, when the off-diagonal exchange interaction J is…
The effect of Dzyaloshinskii-Moriya interactions on the phase diagram and magnetic excitations of SrCu2(BO3)2
Judit Romhanyi, Keisuke Totsuka, Karlo Penc
The orthogonal dimer structure in the SrCu2(BO3)2 spin-1/2 magnet provides a realization of the Shastry-Sutherland model. Using a dimer-product variational wave function, we map ou…