Biography
Judit Romhányi is an Assistant Professor in the Department of Physics and Astronomy at the University of California, Irvine, where she has served since July 2019. She earned her Ph.D. in Physics from Budapest University of Technology and Economics in 2012, focusing on exotic ordering and multipole excitations in anisotropic systems, and completed her diploma (equivalent to M.Sc.) at the same institution in 2006. Prior to joining UCI, Romhányi held postdoctoral positions at the Leibniz Institute for Solid State and Materials Research in Dresden, the Max Planck Institute for Solid State Research in Stuttgart, and the Okinawa Institute of Science and Technology, where she also served as a Staff Scientist from 2017 to 2019.
Romhányi's research focuses on theoretical condensed matter physics, particularly quantum magnetism, topological phases, and multiferroic materials. She has authored 24 peer-reviewed publications in journals including Physical Review Letters, Physical Review B, and Nature Communications. Her work explores topics such as spin-orbit coupling in quantum magnets, topological excitations, and magnetoelectric effects. Romhányi has received significant funding for her research, including an NSF CAREER grant ($687,867, 2022-2026), a Hellman Fellowship Award ($50,000, 2021-2022), and UCI MRSEC Seed Funding ($40,000, 2023-2024). She has presented her research at over 20 invited conferences and delivered numerous invited seminars at institutions worldwide.
At UCI, Romhányi teaches undergraduate and graduate courses including Mathematical Physics, Thermal Physics, and Condensed Matter Physics. She currently advises three graduate students and has mentored several undergraduate researchers. Romhányi contributes to the scientific community through her service as a Member-at-Large of the APS GMAG Topical Group on Magnetism and its Applications, as an ISIS Facility Access Panel Member, and as a reviewer for NSF and DOE grant applications. She is also active in diversity and inclusion efforts, serving on the APS Inclusion, Diversity, and Equity Alliance team and participating in the APS Bridge Program as a faculty mentor.
Return to topEducation
- Ph.D. in Physics, Budapest University of Technology and Economics, 2012
- Diploma in Physics, Budapest University of Technology and Economics, 2006
Distinctions
- NSF CAREER Grant, National Science Foundation, 2022
- JSPS Postdoctoral Fellowship, Japan Society for the Promotion of Science, 2016
- Hellman Fellowship Award, Hellman Foundation, 2021
- BIEP Short-term visitor award, Kyoto University, 2008
Areas of Expertise
- Quantum Magnetism Theory
- Topological Band Theory
- Spin-Orbit Coupling Effects
- Multiferroic Material Properties
- Magnetic Excitation Dynamics
- Altermagnetism Landau Theories
- Triplet Nodal Lines
- Magnetoelectric Multipolar Excitations
- Spin Point Groups
Recent Publications
- Hana Schiff, Alberto Corticelli, Afonso Guerreiro, Judit Romhányi, Paul McClarty, “The crystallographic spin point groups and their representations” (opens in new tab), Scipost Physics, vol. 18, 2025.
- Han Yan, Judit Romhányi, Andreas Thomasen, Nic Shannon, “Pinch points and half moons encode Berry curvature” (opens in new tab), Physical Review B, vol. 110, 2024.
- Shengtao Jiang, Judit Romhányi, Steven R. White, M. E. Zhitomirsky, A. L. Chernyshev, “Where Is The Quantum Spin Nematic?” (opens in new tab), Physical Review Letters, vol. 130, pp. 116701, 2023.
- Kimberly Remund, Rico Pohle, Yutaka Akagi, Judit Romhányi, Nic Shannon, “Semi-classical simulation of spin–1 magnets” (opens in new tab), Physical Review Research, vol. 4, pp. 033106, 2022.
- Andreas Thomasen, Karlo Penc, Nic Shannon, Judit Romhányi, “Fragility of Z₂ topological invariant characterizing triplet excitations in a bilayer kagome magnet” (opens in new tab), Physical Review B, vol. 104, pp. 104412, 2021.
- 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, “In Situ Electric-Field Control of THz Nonreciprocal Directional Dichroism in the Multiferroic Ba₂CoGe₂O₇” (opens in new tab), Physical Review Letters, vol. 127, pp. 157201, 2021.
- J. Romhányi, “Multipolar edge states in the anisotropic kagome antiferromagnet” (opens in new tab), Physical Review B, vol. 99, pp. 014408, 2019.
- V. Kocsis, K. Penc, T. Rõõm, U. Nagel, J. Vít, J. Romhányi, Y. Tokunaga, Y. Taguchi, Y. Tokura, I. Kézsmárki, S. Bordács, “Identification of Antiferromagnetic Domains Via the Optical Magnetoelectric Effect” (opens in new tab), Physical Review Letters, vol. 121, pp. 057601, 2018.
- I. Reshodko, A. Benseny, J. Romhányi, T. Busch, “Topological states in the Kronig-Penney model with arbitrary scattering potentials” (opens in new tab), New Journal of Physics, vol. 21, pp. 013010, 2018.
- J. Romhányi, L. Balents, G. Jackeli, “Spin-Orbit Dimers and Noncollinear Phases in d¹ Cubic Double Perovskites” (opens in new tab), Physical Review Letters, vol. 118, pp. 217202, 2017.
- M. Akaki, D. Yoshizawa, A. Okutani, T. Kida, J. Romhányi, K. Penc, M. Hagiwara, “Direct observation of spin-quadrupolar excitations in Sr₂CoGe₂O₇ by high field electron spin resonance” (opens in new tab), Physical Review B, vol. 96, pp. 214406, 2017.
- 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, D.S. Inosov, “Magnon spectrum of the helimagnetic insulator Cu₂OSeO₃” (opens in new tab), Nature Communications, vol. 7, pp. 10725, 2016.
- 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. Zivković, H. M. Rønnow, “Spin excitations in the skyrmion host Cu₂OSeO₃” (opens in new tab), Physical Review B, vol. 93, pp. 054401, 2016.
- J. Romhányi, K. Penc, R. Ganesh, “Hall effect of triplons in a dimerized quantum magnet” (opens in new tab), Nature Communications, vol. 6, pp. 6805, 2015.
- Nikolay A. Bogdanov, Vamshi M. Katukuri, Judit Romhányi, Viktor Yushankhai, Vladislav Kataev, Bernd Büchner, Jeroen van den Brink, Liviu Hozoi, “Orbital reconstruction in nonpolar tetravalent transition-metal oxide layers” (opens in new tab), Nature Communications, vol. 6, pp. 7306, 2015.
- Judit Romhányi, Guido Burkard, András Pályi, “Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance” (opens in new tab), Physical Review B Condensed Matter and Materials Physics, vol. 92, pp. 054422, 2015.
- M. Ozerov, J. Romhányi, M. Belesi, H. Berger, J.-Ph. Ansermet, J. van den Brink, J. Wosnitza, S. Zvyagin, I. Rousochatzakis, “Establishing the fundamental magnetic interactions in the chiral skyrmionic Mott insulator Cu₂OSeO₃ by terahertz electron spin resonance” (opens in new tab), Physical Review Letters, vol. 113, pp. 157205, 2014.
- Judit Romhányi, Jeroen van den Brink, Ioannis Rousochatzakis, “Entangled tetrahedron ground state and excitations of the magneto-electric skyrmion material Cu₂OSeO₃” (opens in new tab), Physical Review B Condensed Matter and Materials Physics, vol. 90, pp. 140404(R), 2014.
- 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, B. Náfrádi, “Evolution of two-dimensional antiferromagnetism with temperature and magnetic field in multiferroic Ba₂CoGe₂O₇” (opens in new tab), Physical Review B Condensed Matter and Materials Physics, vol. 89, pp. 064403, 2014.
- 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, “Spin-stretching modes in non-centrosymmetric magnets: spin-wave excitations in the multiferroic Ba₂CoGe₂O₇” (opens in new tab), Physical Review Letters, vol. 108, pp. 257203, 2012.
Most Cited Publications
- J. Romhányi, K. Totsuka, K. Penc, “Effect of Dzyaloshinskii-Moriya interactions on the phase diagram and magnetic excitations of SrCu₂(BO₃)₂” (opens in new tab), Physical Review B Condensed Matter and Materials Physics, vol. 83, pp. 024413, 2011.
- Judit Romhányi, Karlo Penc, “Multiboson spin-wave theory for Ba₂CoGe₂O₇, a spin-3/2 easy-plane Néel antiferromagnet with strong single-ion anisotropy” (opens in new tab), Physical Review B Condensed Matter and Materials Physics, vol. 86, pp. 174428, 2012.
- J. Romhányi, M. Lajkó, K. Penc, “Zero- and finite-temperature mean field study of magnetic field induced electric polarization in Ba₂CoGe₂O₇: Effect of the antiferroelectric coupling” (opens in new tab), Physical Review B Condensed Matter and Materials Physics, vol. 84, pp. 224419, 2011.
- J. Romhányi, F. Pollmann, K. Penc, “Supersolid phase and magnetization plateaus observed in the anisotropic spin-3/2 Heisenberg model on bipartite lattices” (opens in new tab), Physical Review B Condensed Matter and Materials Physics, vol. 84, pp. 184427, 2011.
Contact Information
Website: https://physics.uci.edu/judit-romhanyi
Email: jromhany@uci.edu
Phone: +1 (949) 824-4231
Address: University of California, Irvine, Department of Physics & Astronomy, 4129 Frederick Reines Hall, Irvine, CA 92697-4575
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Last updated on 7/28/2025.