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cond-mat.str-el2026
Spin-orbital exchange as a route to intertwined dipole-quadrupole orbital order in MnVO under strong trigonal crystal field
Hiroki Nakai, Yusuke Nomura
Orbitally degenerate systems provide a promising platform for realizing novel quantum phases driven by spin-orbital exchange interactions, as described by the Kugel-Khomskii model.…
cond-mat.str-el2026
Quantum-geometry-driven exact ferromagnetic ground state in a nearly flat band
Taisei Kitamura, Hiroki Nakai, Hosho Katsura +1
We construct a Hubbard model with a nearly flat band whose quantum geometry can be tuned independently of the energy dispersion and the Coulomb interaction. We show that, when the…