Quantum geometry has become central to understanding modern materials, underpinning phenomena from topology to electron localization. But until now, it has remained a largely theoretical concept, with no direct way to measure it. In this work, we show that inelastic x-ray scattering (IXS) provides a direct, quantitative probe of quantum geometry in solids. By measuring […]
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A Long-Predicted Signature Confirmed: Static Susceptibility Divergence in a CDW system
χ(q, ω) is a fundamental quantity that reveals the collective charge dynamics of the material. Despite decades of study, χ(q, ω), near a CDW transition, had never been measured at nonzero momentum, q, with energy resolution that is relevant for these quantum phases. Using momentum-resolved electron energy loss spectroscopy (M-EELS), a technique uniquely sensitive to […]
A New Window into Quantum Geometry and Entanglement
We’re excited to share our latest work, just published in Physical Review B and selected as an Editor’s Suggestion: Quantum entanglement and quantum geometry measured with inelastic x-ray scattering In this study, we explore how quantum geometry and entanglement—usually thought of as purely theoretical concepts—can be directly measured in scattering experiments. We demonstrate a connection […]
Observation of the elusive “demon particle”
We recently observed a new kind of collective excitation called a “demon”. This “particle” was predicted by David Pines in 1956, but it was never observed until we saw it in Sr2RuO4 in our momentum-resolved EELS experiments. Demons are interesting because they are massless and neutral, and do not couple to light, but can have […]
Summer 2023
Two undergraduates have left our group, Nathan Manning, who accepted a position at Bruker, a manufacturer of scientific instruments, and Solomon Michalak, who is entering the Ph.D. program at the University of Minnesota, and Muhammad (Mo) Fadag, who was hired as a patent examiner at the USPTO. This summer, we have a team of new […]