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Our research explores how electron interactions give rise to emergent quantum phases. By combining quantum many-body theory with realistic microscopic models, we seek to uncover the mechanisms of strong correlation phenomena and unconventional superconductivity. We also develop computational methods that connect fundamental theoretical concepts to experimentally observable properties. Through these efforts, we aim to build a microscopic understanding of quantum materials and identify ways to control their properties.
Correlated Quantum Phases
Correlated Quantum Phases
Electron interactions give rise to rich quantum phenomena. We investigate how Coulomb repulsion, Hund’s coupling, and the interplay of spin, orbital, and charge degrees of freedom produce correlated metals, Mott insulators, and ordered phases. Our research spans transition-metal oxides and two-dimensional materials such as moiré heterostructures. By applying quantum many-body theory to microscopic models, we seek to uncover the principles governing correlated quantum phases and explore how they can be controlled.
Representative works:
N. Witt, S. Ryee et al., Phys. Rev. Lett. 136, 046505 (2026) [Editors' Suggestion]
S. Ryee et al., Phys. Rev. B 113, L081106 (2026)
S. Ryee & T. O. Wehling, Nano Letters 23(2), 573-579 (2023)
S. Ryee et al., Phys. Rev. Research 5, 033134 (2023)
S. Ryee et al., Phys. Rev. Lett. 126, 206401 (2021)
Unconventional Superconductivity
Unconventional Superconductivity
We try to understand the mechanisms of unconventional superconductivity and how superconducting properties can be enhanced. With particular interests in nickelates and moiré materials, we investigate how electronic structure, correlations, and fluctuations shape superconducting pairing mechanisms and symmetry. Our broader goal is to establish guiding principles for engineering superconductivity through pressure, strain, carrier doping, and the control of electronic interactions.
Representative works:
S. Ryee et al., Phys. Rev. Lett. 135, 236003 (2025)
A. Fischer et al., Phys. Rev. X 15, 041005 (2025)
S. Ryee et al., Phys. Rev. Lett. 133, 096002 (2024)
Code/Method Development
Code/Method Development
A microscopic understanding of correlated quantum materials requires theoretical tools that connect electronic interactions to observable properties. We develop computational approaches that combine realistic electronic structure with quantum many-body physics. Our goal is to build a practical computational framework, enabling quantitative studies of electronic correlations, competing orders, and spectroscopy in quantum materials.
Representative works:
S. Ryee et al., npj Quantum Mater. 5, 19 (2020)
S. Ryee & M. J. Han, Scientific Reports 7, 4635 (2017)
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