Non-reciprocal circular dichroism of ferro-rotational phonons in MnTiO$_{3}$
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915694997667840 |
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| author | Huang, H. Y. Channagowdra, G. Banerjee, D. Komleva, E. V. Okamoto, J. Chen, C. T. Guennou, M. Johnston, S. Streltsov, S. V. Mou, C. Y. Fujimori, A. Cheong, S-W. Huang, D. J. |
| author_facet | Huang, H. Y. Channagowdra, G. Banerjee, D. Komleva, E. V. Okamoto, J. Chen, C. T. Guennou, M. Johnston, S. Streltsov, S. V. Mou, C. Y. Fujimori, A. Cheong, S-W. Huang, D. J. |
| contents | X-ray circular dichroism (XCD), defined as the difference in absorption or scattering intensity between X-rays of opposite polarizations, arises from the breaking of spatial inversion or time-reversal symmetry and is thus sensitive to chirality, magnetism, and their interplay. Non-reciprocal XCD, in which the dichroic response changes upon reversing the propagation direction of the probe, is generally forbidden in systems with both symmetries. Using resonant inelastic X-ray scattering, we identify circularly polarized phonons in ferro-rotational MnTiO$_3$, which we term ferro-rotational phonons. Their excitations provide a direct demonstration of non-reciprocal XCD in a system that globally preserves inversion and time-reversal symmetries. We propose that a condensate of these phonons, manifested as standing waves, underlies the ferro-rotational order in MnTiO$_3$. The interplay among photon helicity, phonon polarization, and the axial ferro-rotational order gives rise to the observed non-reciprocal circular dichroism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_22050 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Non-reciprocal circular dichroism of ferro-rotational phonons in MnTiO$_{3}$ Huang, H. Y. Channagowdra, G. Banerjee, D. Komleva, E. V. Okamoto, J. Chen, C. T. Guennou, M. Johnston, S. Streltsov, S. V. Mou, C. Y. Fujimori, A. Cheong, S-W. Huang, D. J. Strongly Correlated Electrons Materials Science X-ray circular dichroism (XCD), defined as the difference in absorption or scattering intensity between X-rays of opposite polarizations, arises from the breaking of spatial inversion or time-reversal symmetry and is thus sensitive to chirality, magnetism, and their interplay. Non-reciprocal XCD, in which the dichroic response changes upon reversing the propagation direction of the probe, is generally forbidden in systems with both symmetries. Using resonant inelastic X-ray scattering, we identify circularly polarized phonons in ferro-rotational MnTiO$_3$, which we term ferro-rotational phonons. Their excitations provide a direct demonstration of non-reciprocal XCD in a system that globally preserves inversion and time-reversal symmetries. We propose that a condensate of these phonons, manifested as standing waves, underlies the ferro-rotational order in MnTiO$_3$. The interplay among photon helicity, phonon polarization, and the axial ferro-rotational order gives rise to the observed non-reciprocal circular dichroism. |
| title | Non-reciprocal circular dichroism of ferro-rotational phonons in MnTiO$_{3}$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2512.22050 |