Quantum Geometric Principles for Magnetism and Superconductivity by Prof Youichi Yanase
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Join us at this seminar by Prof Youichi Yanase from Kyoto University. This seminar is organised as part of the IAS Frontiers Seminars: Quantum Horizons, jointly supported by the Institute of Advanced Studies (IAS) and School of Physical and Mathematical Sciences (SPMS).
About the seminar
While the dispersion relation in band structures has long been regarded as a fundamental property of electrons in solids, the geometric structure of Bloch wave functions, encoded in the quantum geometric tensor, has recently emerged as a key ingredient of quantum materials.
We present a unified perspective linking quantum geometry and many-body instabilities in interacting electron systems. We demonstrate that the quantum metric directly controls electronic instabilities, giving rise to ferromagnetism, odd-parity multipole order, and spin-triplet superconductivity. We further reveal its crucial role in the optical responses of superconductors and derive anomalous scaling laws for the superfluid weight of geometric origin.
These results establish a general framework in which quantum geometry serves as a predictive principle for emergent orders and provides a means of identifying exotic superconductors such as twisted multilayer graphene.
About the speaker
Youichi Yanase received his PhD in Science from Kyoto University in 2001 and spent nine years as an assistant professor at the University of Tokyo. After five and a half years at Niigata University, he returned to Kyoto University in 2015. Since 2020, he has been a professor in the Condensed Matter Theory Group at Kyoto University. His groupโs research interests include superconductivity and magnetism with exotic symmetry and topology, nonreciprocal responses in quantum materials, and quantum geometry in condensed matter physics.
This seminar is part of our seminar series, the IAS Frontiers Seminars: Quantum Horizons. The seminars in this series are:
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11 Aug 2026 โ Prof Liang Wu (University of Pennsylvania)
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5 Oct 2026 โ Prof Jia Leo Li (University of Texas at Austin)
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2 Nov 2026 โ Prof Tomas Jungwirth (Academy of Sciences of the Czech Republic)
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16 Nov 2026 โ Prof Youichi Yanase (Kyoto University)
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14 Dec 2026 โ Prof Sven Hรถfling (University of Wรผrzburg)
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25 Jan 2027 โ Prof Maksym Serbyn (Institute of Science and Technology Austria)
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9 Feb 2027 - To be announced.
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5 Mar 2027 - To be announced.
Find out more about these seminars here.