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cond-mat.mes-hall2026
Nonadiabatic Theory of Phonon Magnetic Moments in Insulators and Metals
Haoran Chen, Wenqin Chen, Kaijie Yang +2
We develop a nonadiabatic theory of phonon magnetic moments applicable to both insulators and metals. By relating the phonon magnetic moment to the force-velocity response of ions…
cond-mat.supr-con2026
Quantum Geometric Quadrupole of Cooper Pairs
Wenqin Chen, Kaijie Yang, Ting Cao +3
The size of Cooper pairs defines a fundamental length scale of superconductivity, conventionally set by band dispersion and the superconducting gap. This picture breaks down in fla…