Constraints on magnetism and correlations in RuO₂ from lattice dynamics and Mössbauer spectroscopy
Cell Reports Physical Sciences, 2025
View Publication →Research Initiatives
Magnon-Phonon Interactions
In this line of work, we use inelastic neutron and resonant X-ray scattering on itinerant antiferromagnets and correlated insulators to resolve how magnon branches hybridize with optical phonons. By quantifying dispersion renormalization, linewidth broadening and spectral-weight transfer, we build microscopic models that connect spinlattice coupling to macroscopic transport properties. The broader goal is to understand when magnonphonon coupling can be engineered to either enhance or suppress heat and spin currents in candidate magnonic and thermoelectric devices.
Neutron Scattering
Magnons
Thermal Transport
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High-Entropy Oxides
Here we study chemically complex, high-entropy oxides and characterize them mainly using neutron and X-ray diffraction and total scattering to map how multi-cation disorder and strain fields shape their magnetic landscape. By focusing on how scattering signatures evolve with temperature and field, and comparing to reported macroscopic responses, we distinguish conventional glassy freezing from genuinely frustrated collective states. Statistical and mean-field models then link the enormous cation-configuration space to experimentally observed scattering signatures, with an eye toward designing disordered oxides that host robust, tunable magnetic functionalities.
Disorder
Magnetism
X-ray Scattering
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Honeycomb Lattice Magnetism
We work on artificial permalloy honeycomb lattices that realize tunable, frustrated Ising-like networks. We track how field history, temperature and geometry drive the system between ice-like, charge-ordered and diode-like conducting states, and relate these regimes to changes in their collective magnetic configurations. Simple models then connect local vertex configurations and magnetic-charge textures to non-reciprocal transport signatures and ultra-low forward-voltage behaviour, highlighting routes toward neuromorphic elements and energy-efficient magnetic diodes built from geometrically engineered frustration.
Frustrated Systems
Topology
Magnetism
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Quantum Magnetism
In this initiative, I work on model quantum magnets where reduced dimensionality, frustration and anisotropic exchange produce large quantum fluctuations. Using elastic and inelastic neutron scattering together with numerical modelling, we search for proximate spin-liquid regimes, multipolar orders and excitation continua that go beyond simple magnon pictures. The aim is to identify chemically accessible platforms where entangled ground states and robust collective modes coexist, providing realistic opportunities to couple quantum spin degrees of freedom to spintronic or quantum-information architectures.
Quantum Materials
Spintronics
DFT
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