Multipolar multiferroics in $4d^2$/$5d^2$ Mott insulators
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arXiv
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| Format: | Preprint |
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2024
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| author | Banerjee, Saikat Humeniuk, Stephan Bishop, Alan R. Saxena, Avadh Balatsky, Alexander V. |
| author_facet | Banerjee, Saikat Humeniuk, Stephan Bishop, Alan R. Saxena, Avadh Balatsky, Alexander V. |
| contents | We extend the concept of conventional multiferroicity \ -- where ferroelectric and ferromagnetic orders coexist \ -- to include multipolar degrees of freedom. Specifically, we explore how this phenomenon emerges in $4d^2/5d^2$ Mott insulators with strong spin-orbit and Hund's couplings. Our study uncovers the origin of magnetic multipolar interactions in these systems and demonstrates that a combination of quadrupolar and octupolar magnetic order can simultaneously induce both electrical quadrupolar moments and ferroelectric polarization. By expanding the multiferroic framework to higher-order multipoles, we reveal the possibility of coexisting multipolar orders of different or same ranks, paving the way for new functional properties in a large class of strongly correlated materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_17389 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multipolar multiferroics in $4d^2$/$5d^2$ Mott insulators Banerjee, Saikat Humeniuk, Stephan Bishop, Alan R. Saxena, Avadh Balatsky, Alexander V. Strongly Correlated Electrons We extend the concept of conventional multiferroicity \ -- where ferroelectric and ferromagnetic orders coexist \ -- to include multipolar degrees of freedom. Specifically, we explore how this phenomenon emerges in $4d^2/5d^2$ Mott insulators with strong spin-orbit and Hund's couplings. Our study uncovers the origin of magnetic multipolar interactions in these systems and demonstrates that a combination of quadrupolar and octupolar magnetic order can simultaneously induce both electrical quadrupolar moments and ferroelectric polarization. By expanding the multiferroic framework to higher-order multipoles, we reveal the possibility of coexisting multipolar orders of different or same ranks, paving the way for new functional properties in a large class of strongly correlated materials. |
| title | Multipolar multiferroics in $4d^2$/$5d^2$ Mott insulators |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.17389 |