Derives algebraic constraints ensuring flat bands in the one-magnon spectrum of a J1-J2-J3 XXZ sawtooth chain with Dzyaloshinskii-Moriya interactions and maps them to Katsura-Nagaosa-Balatsky parameters for electric-field tuning.
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On flat bands in the $J_1$-$J_2$-$J_3$ XXZ sawtooth chain
Derives algebraic constraints ensuring flat bands in the one-magnon spectrum of a J1-J2-J3 XXZ sawtooth chain with Dzyaloshinskii-Moriya interactions and maps them to Katsura-Nagaosa-Balatsky parameters for electric-field tuning.