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cond-mat.mes-hall2026
Nonlinear Frequency-Momentum Topology and Doubling of Multifold Exceptional Points
Tsuneya Yoshida
Even in the linear limit, the topology of multifold (also called higher-order) exceptional points across the Brillouin zone has lacked a general characterization, leaving the doubl…
cond-mat.mes-hall2026
Interaction-Enabled Two- and Three-Fold Exceptional Points
Musashi Kato, Tsuneya Yoshida
We propose a novel type of exceptional points, dubbed interaction-enabled -fold exceptional points [EPs ()] -- EPs protected by topology that are prohibited at the…