QMT QUANTUM MATERIALS THEORY
materials theory • multiferroics • domain walls and switching • noncollinear magnets • topological phenomena • quantum geometry

We develop realistic models for emergent phenomena in quantum materials. We study static properties and dynamics in materals with complex orders, such as noncollinear magnets, multiferroics, ferroelectric domain structures. We closely collaborate with experimentalists to interpret puzzling data.

Team

Sergey Artyukhin portrait

PI

(Multi)ferroics, magnetoelectric effect, topological defects and their dynamics, noncollinear magnets, Berry phase phenomena.

Google Scholar
Ravi Kaushik portrait

Doctoral Student

Magnetic interactions at finite-temperatures, electron-phonon and spin-phonon coupling, first-principles simulations, multiferroics.

Google Scholar
Luca Maranzana portrait

Doctoral Student

Quantum metric effects, topological pumping of bimerons, merons, and fast ferrimagnetic domain-wall dynamics.

Margherita Parodi portrait

Doctoral Student

Noncollinear magnets, magnon thermal conductivity, and electric-field-driven domain wall motion in spin spirals.

Aleksandr Buzdakov portrait

Postdoc

Ultrafast laser-induced spin dynamics, antiferromagnetic writing via magnetoelectric fields, spin-lattice coupling, and nonlinear magnon transport.

Google Scholar

Publications

Semiclassical Wave-Packet Dynamics in Phase-Space Geometry: Quantum Metric Effects

Luca Maranzana, Koki Shinada, Ying-Ming Xie, Sergey Artyukhin, and Naoto Nagaosa
arXiv:2603.21262 (2026)

A phase-space treatment of quantum geometry puts real-space and momentum-space effects on equal footing for transport and optical phenomena.

Thermal conductivity in noncollinear magnets

Margherita Parodi and Sergey Artyukhin
arXiv:2602.03326 (2026)

We develop theory of heat transport in noncollinear magnets. Spin noncollinearity leads to three-magnon processes that reduce thermal conductivity. We uncover the relaxons, relaxation modes in the space of magnon occupations, that govern magnetic thermal conductivity.

Highly controllable switching pathways in multiferroic GdMn_2O_5

M. Ryzhkov, A. Granero, J. Wettstein, Anna Pimenov, X. Wang, L. Ponet, S.-W. Cheong, M. Mostovoy, and Sergey Artyukhin
arXiv:2602.02939 (2026)
Communications Materials

Electric fields control magnetic switching pathway in multiferroic GdMn2O5, a material with topological order parameter switching process.

Rocket-like dynamics of ferrimagnetic domain walls in graded materials

P. Diona, S. Artyukhin, and L. Maranzana
arXiv:2601.21068 (2026)
PRB, in press

Composition gradients in ferrimagnets are shown to enable new physical mechanisms for domain wall acceleration, with potential for faster racetrack and THz spintronic devices.

Larkin length as a criterion for antiferromagnetic writing

Nikolai Khokhlov, Aleksandr Buzdakov, Timur Gareev, Sheng Li, Xuewen Wang, Sergey Artyukhin, and Alexey Kimel
Research Square preprint (2026)
Simulation plot for nonlocal magnetoelectric switching in spiral multiferroics

Nonlocal magnetoelectric switching in spiral multiferroics

F. Foggetti, M. Parodi, N. Nagaosa, and S. Artyukhin
Newton 2, 100375 (2026)

Competition between multiferroic and magnetic soliton lattice states in DyFeO3

S. E. Nikitin, N. D. Andriushin, O. S. Fjellvag, E. Pomjakushina, A. A. Turrini, S. Artyukhin, C. W. Schneider, and M. Mostovoy
Physical Review Research 7 (4), 043173 (2025)

Finite temperature magnetic interactions from first principles

Ravi Kaushik, Ryota Ono, and Sergey Artyukhin
arXiv:2510.16143 (2025)

We introduce an ab-initio approach to study temperature dependence of exchange interactions, discuss the mechanisms that govern the temperature dependence and find 10% increase in exchange interactions at room temperature in Cr2O3.

Spiral multiferroics as a natural skyrmion racetrack

Luca Maranzana, Maxim Mostovoy, Naoto Nagaosa, and Sergey Artyukhin
arXiv:2502.13083 (2025)

Group IV binary carbides with double layer honeycomb lattice structure

Mehrdad Faraji, Aditya Putatunda, Alexander Schleusener, Sergey Artyukhin, and Roman Krahne
Journal of Applied Physics 138 (8) (2025)

Topologically protected magnetoelectric switching in a multiferroic

Louis Ponet, S. Artyukhin, Th. Kain, J. Wettstein, Anna Pimenov, A. Shuvaev, X. Wang, S.-W. Cheong, Maxim Mostovoy, and Andrei Pimenov
Nature 607 (7917), 81-85 (2022)

Ferroelectricity and topological vortices from molecular ordering in metal-organic frameworks

F. Foggetti, A. Stroppa, and S. Artyukhin
arXiv:2204.09546 (2022)

Electric field-induced domain wall motion in spin spiral multiferroics

F. Foggetti, M. Parodi, N. Nagaosa, and S. Artyukhin
arXiv:2204.09027 (2022)

Conferences

DPG Spring Meeting 2026 (Dresden)

Codes

  • LInvariant — Second-principles code based on Landau-theory-like order parameter expansion. (Peng Chen)
  • Finite element code — Ferroelectricity, strains, and domain wall-localized phonons [npj Comput. Mater. 6, 62 (2020)]. (Peng Chen, Louis Ponet)
  • MargDYN — Atomistic spin dynamics code with time-dependent perturbations, angle unrolling, and free energy calculations. (Margherita Parodi)
  • DFPT exchange from W90 — Exchange interactions from density-functional perturbation theory via Wannier90.

Former Members

  • Peng Chen — Associate Professor, Guangdong Technion–Israel Institute of Technology, Shantou, China
  • Louis Ponet — Postdoc, EPFL — Bitcoin London
  • Francesco Foggetti — Postdoc, Oppeneer group, Uppsala University
  • Aditya Putatunda — Postdoc, Picozzi group, Milano Bicocca, Italy
  • Ryota Ono — Researcher, Japan Atomic Energy Agency (JAEA), Japan
  • Evgenii Barts — Postdoc, Nagaosa group, RIKEN CEMS, Tokyo, Japan
  • Giulia Biffi — Research Scientist, Siemens, Netherlands
  • Urko Petralanda — Assistant Professor, University of the Basque Country (UPV/EHU), Bilbao

Theses