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cond-mat.mtrl-sci2025★ 9 cited
Quantum geometric bounds for observables: Linear responses, Drude weight, and orbital magnetization
Koki Shinada, Naoto Nagaosa
The quantum geometric tensor (QGT) provides nontrivial bounds among physical quantities, as exemplified by the metric-curvature inequality. In this paper, we investigate various bo…
cond-mat.mtrl-sci2025★ 6 cited
Thermodynamic formulation of the spin magnetic octupole moment in bulk crystals
Jun Ōiké, Robert Peters, Koki Shinada
The discovery of unconventional antiferromagnets, such as altermagnets, has drawn significant attention to higher-rank magnetic multipoles, particularly magnetic octupoles. Despite…