Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster I
MA 15.33: Poster
Dienstag, 18. März 2025, 10:00–12:30, P1
Flat bands and megnetoelectric effect in XX sawtooth chain with three-spin interactions — •Karen Baghdasaryan1, Vadim Ohanyan2,3, Ostap Baran4, and Oleg Derzhko4 — 1Ludwig-Maximilians-Universität, München, Germany — 2Yerevan State University, Yerevan, Armenia — 3CANDLE Synchrotron Research Institute, Yerevan, Armenia — 4Institute for Condensed Matter Physics, Lviv, Ukraine
We present an exact analysis of the XX sawtooth chain with three-spin interactions and the Katsura-Nagaosa-Balatsky (KNB) mechanism. Using Jordan-Wigner fermionization, we identify all zero-temperature phases of the model and observe the emergence of a flat band in the free-fermion spectrum. These flat bands result in jumps in observables such as magnetization and dielectric polarization as functions of both magnetic and electric fields.
Keywords: Sawtooth chain; Jordan-Wigner fermionization; Flat bands; Katsura-Nagaosa-Balatsky mechanism