Engineering altermagnetic orders on the square-kagome lattice through sublattice interference
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917335506354176 |
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| author | Issing, Jonas Seufert, Jannis Klett, Michael Mazumdar, Sarbajit Iqbal, Yasir Thomale, Ronny Maity, Atanu |
| author_facet | Issing, Jonas Seufert, Jannis Klett, Michael Mazumdar, Sarbajit Iqbal, Yasir Thomale, Ronny Maity, Atanu |
| contents | We investigate the emergence of altermagnetic (AM) phases on the square-kagome lattice. Our analysis reveals that matrix element effects due to an orthogonal sublattice weight decomposition of Fermi level eigenstates known as sublattice interference enable decoupled magnetic ordering tendencies on distinct sublattices. Depending on which sublattice undergoes a magnetic instability, we identify a $d_{xy}$-type AM phase and a $d_{x^{2}-y^{2}}$-type AM phase originating from different sublattice polarization patterns. Using the Kotliar-Ruckenstein slave boson formalism we explore the stability of these AM phases as a function of interaction strength. Our findings demonstrate that sublattice-selective magnetic instabilities provide a versatile route to engineer the nature of AM order. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_12022 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Engineering altermagnetic orders on the square-kagome lattice through sublattice interference Issing, Jonas Seufert, Jannis Klett, Michael Mazumdar, Sarbajit Iqbal, Yasir Thomale, Ronny Maity, Atanu Strongly Correlated Electrons We investigate the emergence of altermagnetic (AM) phases on the square-kagome lattice. Our analysis reveals that matrix element effects due to an orthogonal sublattice weight decomposition of Fermi level eigenstates known as sublattice interference enable decoupled magnetic ordering tendencies on distinct sublattices. Depending on which sublattice undergoes a magnetic instability, we identify a $d_{xy}$-type AM phase and a $d_{x^{2}-y^{2}}$-type AM phase originating from different sublattice polarization patterns. Using the Kotliar-Ruckenstein slave boson formalism we explore the stability of these AM phases as a function of interaction strength. Our findings demonstrate that sublattice-selective magnetic instabilities provide a versatile route to engineer the nature of AM order. |
| title | Engineering altermagnetic orders on the square-kagome lattice through sublattice interference |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.12022 |