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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2512.00900 |
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| _version_ | 1866917426957910016 |
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| author | Ohanyan, Vadim Amiraghyan, Lusik Sekania, Michael Kollar, Marcus |
| author_facet | Ohanyan, Vadim Amiraghyan, Lusik Sekania, Michael Kollar, Marcus |
| contents | We investigate flat magnonic bands in a generalized sawtooth-chain
model in which three sets of exchange parameters (symmetric
Heisenberg exchange, axial Ising anisotropy, and antisymmetric
Dzyaloshinskii-Moriya (DM) exchange) are assigned independently to
each side of the triangular plaquette. If the effective
Dzyaloshinskii-Moriya (DM) interaction parameters are generated
via the Katsura-Nagaosa-Balatsky (KNB) mechanism of
magnetoelectricity, they become explicit functions of the
electric-field magnitude and direction, as well as of the lattice
geometry, which in the present casen is characterized by two bond
angles. We focus on the situation in which these two angles are
unequal, corresponding to a distortion of the triangular
plaquette. Several electric-field induced flat-band scenarios in
the distorted sawtooth chain are analyzed, and expressions are
derived for the electric-field strength required to drive the
one-magnon excitations into a flat-band regime when the field is
aligned along the lattice bonds. The saturation field and its
dependence on the distortion angle are also examined. Finally, we
establish a mapping between the flat-band solutions for a general
DM interaction and its specific KNB-induced form.
\\~
\emph{This article is dedicated to the memory of Johannes Richter.} |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_00900 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electric-field driven flat bands in the distorted sawtooth chain via the Katsura-Nagaosa-Balatsky mechanism Ohanyan, Vadim Amiraghyan, Lusik Sekania, Michael Kollar, Marcus Strongly Correlated Electrons We investigate flat magnonic bands in a generalized sawtooth-chain model in which three sets of exchange parameters (symmetric Heisenberg exchange, axial Ising anisotropy, and antisymmetric Dzyaloshinskii-Moriya (DM) exchange) are assigned independently to each side of the triangular plaquette. If the effective Dzyaloshinskii-Moriya (DM) interaction parameters are generated via the Katsura-Nagaosa-Balatsky (KNB) mechanism of magnetoelectricity, they become explicit functions of the electric-field magnitude and direction, as well as of the lattice geometry, which in the present casen is characterized by two bond angles. We focus on the situation in which these two angles are unequal, corresponding to a distortion of the triangular plaquette. Several electric-field induced flat-band scenarios in the distorted sawtooth chain are analyzed, and expressions are derived for the electric-field strength required to drive the one-magnon excitations into a flat-band regime when the field is aligned along the lattice bonds. The saturation field and its dependence on the distortion angle are also examined. Finally, we establish a mapping between the flat-band solutions for a general DM interaction and its specific KNB-induced form. \\~ \emph{This article is dedicated to the memory of Johannes Richter.} |
| title | Electric-field driven flat bands in the distorted sawtooth chain via the Katsura-Nagaosa-Balatsky mechanism |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.00900 |