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cond-mat.str-el2025
Quantum geometric ferromagnetism by singular saddle point
Taisei Kitamura, Hiroki Nakai, Akito Daido +1
We propose ferromagnetism that occurs in electrons at a saddle point with band touching, which we call the singular saddle point. At the singular saddle point, the divergent quantu…
cond-mat.str-el2025★ 1 cited
Spinor ice correlation in flat-band electronic states on kagome and pyrochlore lattices with spin-orbit coupling
Hiroki Nakai, Masafumi Udagawa, Chisa Hotta
We investigate the emergence and transformation of pinch-point singularities in the excitation spectrum of electronic flat band systems on kagome and pyrochlore lattices with spin-…