Postdoctoral Fellow
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Research group| Condensed Matter Physics |
Main supervisor|?Morten Hjorth-Jensen
Affiliation |?Department of Physics, UiO
Contact |?Cecilie Glittum
Short bio
I completed my PhD in theoretical condensed matter physics at the University of Cambridge in 2024. My thesis, titled Wonderland of frustration: Magnetic moments and itinerant electrons on the pyrochlore lattice, explored the effects frustration – the inability to simultaneously minimise all energy terms – has on the ground state and emergent phases of magnetic materials, both when the frustration arises from magnetic exchange interactions and when kinetic effects frustrate the system.
After my PhD, I worked for one year as a postdoctoral researcher at Helmholtz-Zentrum Berlin and Freie Universit?t Berlin.
Currently, I am a postdoctoral research fellow at UiO under the DSTrain MSCA fellowship, working at the Department of Physics. My work focuses on magnetism, quantum technology and artificial intelligence.
Research interests and hobbies
My research explores the physics of frustrated magnetic systems. Magnetic materials are made up of microscopic magnetic moments (spins). In ferromagnets, the energy is minimised by all spins aligning, causing a macroscopic magnetic moment. In another, more complex type of magnet, the antiferromagnet, spins anti-align with no macroscopic magnetic moment. Despite their different microscopic and macroscopic properties, ferro- and antiferromagnets both have in common that the ground state is uniquely determined by minimizing all pairwise interactions between the spins. In a frustrated magnet, the spins cannot minimize all interactions simultaneously due to the geometry of the lattice and/or competing interactions. This frustration gives rise to a large degeneracy of the system’s ground state, making frustrated magnets particularly interesting, as it may lead to emergence of exotic phases like quantum spin liquids — a topic relevant for high-temperature superconductivity and emerging quantum technologies.
I am especially interested in how doping (removing electrons from the system) stabilises quantum spin liquids, using computational tools such as exact diagonalisation, tensor networks, and neural quantum states.
Beyond research, I enjoy baking and listening to Taylor Swift.
DSTrain project
DSIPNN: Doping-induced quantum SPIn liquids applying Neural Networks
My DSTrain project bridges quantum technology and artificial intelligence by investigating quantum spin liquids through neural network methods. Quantum spin liquids, known for their fractionalised excitations and strong entanglement, are promising for developing stable qubits and advancing quantum computing. Inspired by recent theoretical progress, my project examines the role of kinetic frustration — distinct from conventional magnetic frustration — in stabilising quantum spin liquids, especially in doped Mott insulators on checkerboard and pyrochlore lattices.
By leveraging neural quantum states, I aim to push numerical simulations to deepen our fundamental insights of doping-induced quantum spin liquids and study their stability in more material relevant models.
Publications
DSTrain publications
ORCID ID: https://orcid.org/0000-0003-2679-5641
Zhao Zhang and Cecilie Glittum, “Resonant Valence Bond Ground States on Corner-sharing Lattices”, arXiv: 2507.10471 (2025). [https://doi.org/10.48550/arXiv.2507.10471] (preprint)
Previous publications
- Cecilie Glittum and Olav F. Sylju?sen, “The Finite-Temperature Behavior of a Triangular Heisenberg Antiferromagnet”, arXiv:2510.02042, (2025). [https://doi.org/10.48550/arXiv.2510.02042]
- Cecilie Glittum and Olav F. Sylju?sen, “Field-induced multi-Q states in a pyrochlore Heisenberg magnet”, Phys. Rev. B 111, 214444 (2025). [https://doi.org/10.1103/5rsg-2klm]
- Cecilie Glittum, Antonio ?trkalj, Dharmalingam Prabhakaran, Paul A. Goddard, Cristian D. Batista, and Claudio Castelnovo, “A resonant valence bond spin liquid in the dilute limit of doped frustrated Mott insulators”, Nature Physics 21, 1211-1216 (2025). [https://doi.org/10.1038/s41567-025-02923-8]
- PhD thesis: Cecilie Glittum, “Wonderland of frustration: Magnetic moments and itinerant electrons on the pyrochlore lattice”, (2024). [https://doi.org/10.17863/CAM.114778]
- Cecilie Glittum and Olav F. Sylju?sen, “Sublattice pairing in pyrochlore Heisenberg antiferromagnets”, Phys. Rev. B 108, 014413 (2023). [https://doi.org/10.1103/PhysRevB.108.014413]
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