Home Publications Research Group

Preprints

  1. Terahertz detection of in-situ switching between antiferromagnetic domains in the multiferroic Ba2CoGe2O7

    J. Vít, J. Viirok, L. Peedu, T. Rõõm, U. Nagel, V. Kocsis, Y. Tokunaga, Y. Taguchi, Y. Tokura, I. Kézsmárki, P. Balla, K. Penc, J. Romhányi, S. Bordács
    arXiv:2101.10045

Publications

  1. Fragility of Z2 topological invariant characterizing triplet excitations in a bilayer kagome magnet

    Andreas Thomasen, Karlo Penc, Nic Shannon, and Judit Romhányi
    Phys. Rev. B 104, 104412 (2021)
    arXiv:2012.11765

  2. Multipolar edge states in the anisotropic kagome antiferromagnet

    Judit Romhányi
    Phys. Rev. B 99, 014408 (2019)
    arXiv:1801.07950

  3. Topological states in the Kronig-Penney model with arbitrary scattering potentials

    I. Reshodko, A. Benseny, J. Romhányi, and T. Busch
    New Journal of Physics (2018)
    arXiv:1807.02949

  4. Identification of Antiferromagnetic Domains Via the Optical Magnetoelectric Effect

    V. Kocsis, K. Penc, T. Rõõm, U. Nagel, J. Vít, J. Romhányi, Y. Tokunaga, Y. Taguchi, Y. Tokura, I. Kézsmárki, S. Bordács
    Phys. Rev. Lett. 121, 057601 (2018)
    arXiv:1711.08124

  5. Direct observation of spin-quadrupolar excitations in Sr2CoGe2O7 by high-field elec- tron spin resonance

    M. Akaki, D. Yoshizawa, A. Okutani, T. Kida, J. Romhányi, K. Penc, M. Hagiwara
    Phys. Rev. B 96, 214406 (2017)
    arXiv:1702.04158

  6. Spin-Orbit Dimers and Noncollinear Phases in d1 Cubic Double Perovskites

    J. Romhányi, L. Balents, G. Jackeli
    Phys. Rev. Lett. 118, 217202 (2017)
    arXiv:1611.00646

  7. Spin excitations in the skyrmion host Cu2OSeO3

    G. S. Tucker, J. S. White, J. Romhányi, D. Szaller, I. Kézsmárki, B. Roessli, U. Stuhr, A. Magrez, F. Groitl, P. Babkevich, P. Huang, I. Z ̆ivković, and H. M. Rønnow
    Phys. Rev. B 93, 054401 (2016)
    arXiv:1607.08708

  8. Magnon spectrum of the helimagnetic insulator Cu2OSeO3

    P.Y. Portnichenko, J. Romhányi, Y.A. Onykiienko, A. Henschel, M. Schmidt, A.S. Cameron, M.A. Surmach, J.A. Lim, J.T. Park, A. Schneidewind, D.L. Abernathy, H. Rosner, Jeroen van den Brink and D.S. Inosov
    Nat. Commun. 7, Article number: 10725 (2016)
    arXiv:1509.02432

  9. Orbital reconstruction in nonpolar tetravalent transition-metal oxide layers

    Nikolay A. Bogdanov, Vamshi M. Katukuri, Judit Romhányi, Viktor Yushankhai, Vladislav Kataev, Bernd Büchner, Jeroen van den Brink, and Liviu Hozoi
    Nat. Commun. 6, Article number: 7306 (2015)
    arXiv:1604.07780

  10. Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance

    Judit Romhányi, Guido Burkard, András Pályi
    Phys. Rev. B 92, 054422 (2015)
    arXiv:1504.06081

  11. Hall effect of triplons in a dimerized quantum magnet

    J. Romhányi, K. Penc and R. Ganesh
    Nat. Commun. 6, Article number: 6805 (2015)
    arXiv:1406.1163

  12. Establishing the fundamental magnetic interactions in the chiral skyrmionic Mott insulator Cu2OSeO3 by terahertz electron spin resonance

    M. Ozerov, J. Romhányi, M. Belesi, H. Berger, J.-Ph. Ansermet, J. van den Brink, J. Wosnitza, S. Zvyagin, and I. Rousochatzakis
    Phys. Rev. Lett. 113, 157205 (2014)
    arXiv:1404.7319

  13. Entangled tetrahedron ground state and excitations of the magneto-electric skyrmion material Cu2OSeO3

    Judit Romhányi, Jeroen van den Brink and Ioannis Rousochatzakis
    Phys. Rev. B 90, 140404(R) (2014)
    arXiv:1403.4081

  14. Evolution of two-dimensional antiferromagnetism with temperature and magnetic field in multiferroic Ba2CoGe2O7

    V. Hutanu, A.P. Sazonov, M. Meven, G. Roth, A. Gukasov, H. Murakawa, Y. Tokura, D. Szaller, S. Bordács, I. Kézsmárki, V.K. Guduru, L.C.J.M. Peters, U. Zeitler, J. Romhányi and B. Náfrádi
    Phys. Rev. B 90, 140404(R) (2014)
    arXiv:1401.4517

  15. Multiboson spin-wave theory for Ba2CoGe2O7, a spin-3/2 easy-plane Neel antiferromagnet with strong single-ion anisotropy

    Judit Romhányi and Karlo Penc
    Phys. Rev. B 86, 174428 (2012)
    arXiv:1205.2196

  16. Spin-stretching modes in non-centrosymmetric magnets: spin-wave excitations in the multiferroic Ba2CoGe2O7

    K. Penc, J. Romhányi, T. Rõõm, U. Nagel, Á. Antal, T. Fehér, A. Jánossy, H. Engelkamp, H. Murakawa, Y. Tokura, D. Szaller, S. Bordács, I. Kézsmárki
    Phys. Rev. Lett. 108, 257203 (2012)
    arXiv:1202.3996

  17. Zero- and finite-temperature mean field study of magnetic field induced electric polarization in Ba2CoGe2O7: Effect of the antiferroelectric coupling

    J. Romhányi, M. Lajkó, K. Penc
    Phys. Rev. B 84, 224419 (2011)
    arXiv:1110.0788

  18. Supersolid phase and magnetization plateaus observed in the anisotropic spin-3/2 Heisenberg model on bipartite lattices

    J. Romhányi, F. Pollmann, K. Penc
    Phys. Rev. B 84, 184427 (2011)
    arXiv:1109.4078

  19. Effect of Dzyaloshinskii-Moriya interactions on the phase diagram and magnetic excitations of SrCu2(BO3)2

    J. Romhányi, K. Totsuka, K. Penc
    Phys. Rev. B 83, 024413 (2011)
    arXiv:1010.4476