Home Publications Research Group

Preprints

  1. Fracton Spin Liquid and Exotic Frustrated Phases in Ising-like Octochlore Magnets

    Matthew Stern, Michael D. Burke, Michel J. P. Gingras, Judit Romhányi, and Kristian Tyn Kai Chung
    arXiv:2603.12313

  2. AKLT Hamiltonian from Hubbard tripods

    Claire Benjamin, Dániel Varjas, Gábor Széchenyi, Judit Romhányi, László Oroszlány
    arXiv:2603.06455

Publications

  1. Triplet nodal lines and Chern bands in XCuCl3 (X= K, Tl)

    Charles B. Walker, Matthew Stern, and Judit Romhányi
    Phys. Rev. B 113, 094448 (2026)
    arXiv:2507.00285

  2. Collinear Altermagnets and their Landau Theories

    Hana Schiff, Paul McClarty, Jeffrey G. Rau, and Judit Romhanyi
    Phys. Rev. Research 7, 033301 (2025)
    arXiv:2412.18025

  3. The Crystallographic Spin Point Groups and their Representations

    Hana Schiff, Alberto Corticelli, Afonso Guerreiro, Judit Romhányi, and Paul McClarty
    SciPost Phys. 18, 109 (2025)
    arXiv:2307.12784

  4. Pinch points and half moons encode Berry curvature

    Han Yan, Andreas Thomasen, Judit Romhányi, Nic Shannon
    Phys. Rev. B 110, 195117 (2024)
    arXiv:2304.02203

  5. Where is the Quantum Spin Nematic?

    Shengtao Jiang, Judit Romhányi, Steven R. White, M. E. Zhitomirsky, A. L. Chernyshev
    Phys. Rev. Lett. 130, 116701 (2023)
    arXiv:2209.00010

  6. Semi-classical simulation of spin-1 magnets

    Kimberly Remund, Rico Pohle, Yutaka Akagi, Judit Romhányi, Nic Shannon
    Phys. Rev. Research 4, 033106 (2022)
    arXiv:2203.09819

  7. In Situ Electric-Field Control of THz Nonreciprocal Directional Dichroism 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
    Phys. Rev. Lett. 127, 157201 (2021)
    arXiv:2101.10045

  8. 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

  9. Multipolar edge states in the anisotropic kagome antiferromagnet

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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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

  26. 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