Preprints

Publications

1. 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
   
   

2. 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
   
   

3. Multipolar edge states in the anisotropic kagome antiferromagnet

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

4. 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
   
   

5. 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
   
   

6. 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
   
   

7. 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
   
   

8. 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
   
   

9. 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
   
   

10. 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
    
    

11. 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
    
    

12. 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
    
    

13. 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
    
    

14. 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
    
    

15. 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
    
    

16. 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
    
    

17. 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
    
    

18. 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
    
    

19. 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
    
    

20. 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