Directionally asymmetric nonlinear optics in planar chiral MnTiO$_3$
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917813556346880 |
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| author | Zhang, Xinshu Carbin, Tyler Du, Kai Li, Bingqing Wang, Kefeng Li, Casey Qian, Tiema Ni, Ni Cheong, Sang-Wook Kogar, Anshul |
| author_facet | Zhang, Xinshu Carbin, Tyler Du, Kai Li, Bingqing Wang, Kefeng Li, Casey Qian, Tiema Ni, Ni Cheong, Sang-Wook Kogar, Anshul |
| contents | Planar chiral structures possess a two dimensional handedness that is associated with broken mirror symmetry. Such motifs span vast length scales; examples include certain pinwheel molecules, nautilus shells, cyclone wind patterns and spiral galaxies. Although pervasive in nature, it has only recently been found that condensed matter systems can exhibit a form of planar chirality through toroidal arrangements of electric dipoles, known as ferro-rotational (FR) order. A key characteristic of such order is that enantiomorph conversion occurs when the solid is flipped by 180 degrees about an in-plane axis. Consequently, ferro-rotationally ordered materials may exhibit directionally asymmetric response functions, even while preserving inversion and time-reversal symmetry. Such an effect, however, has yet to be observed. Using second harmonic interferometry, we show here that when circularly polarized light is incident on MnTiO$_3$, the generated nonlinear signal exhibits directional asymmetry. Depending on whether the incident light is parallel or anti-parallel to the FR axis, we observe a different conversion efficiency of two right (left) circularly polarized photons into a frequency-doubled left (right) circularly polarized photon. Our work uncovers a fundamentally new optical effect in ordered solids and opens up the possibility for developing novel nonlinear and directionally asymmetric optical devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_18086 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Directionally asymmetric nonlinear optics in planar chiral MnTiO$_3$ Zhang, Xinshu Carbin, Tyler Du, Kai Li, Bingqing Wang, Kefeng Li, Casey Qian, Tiema Ni, Ni Cheong, Sang-Wook Kogar, Anshul Optics Strongly Correlated Electrons Planar chiral structures possess a two dimensional handedness that is associated with broken mirror symmetry. Such motifs span vast length scales; examples include certain pinwheel molecules, nautilus shells, cyclone wind patterns and spiral galaxies. Although pervasive in nature, it has only recently been found that condensed matter systems can exhibit a form of planar chirality through toroidal arrangements of electric dipoles, known as ferro-rotational (FR) order. A key characteristic of such order is that enantiomorph conversion occurs when the solid is flipped by 180 degrees about an in-plane axis. Consequently, ferro-rotationally ordered materials may exhibit directionally asymmetric response functions, even while preserving inversion and time-reversal symmetry. Such an effect, however, has yet to be observed. Using second harmonic interferometry, we show here that when circularly polarized light is incident on MnTiO$_3$, the generated nonlinear signal exhibits directional asymmetry. Depending on whether the incident light is parallel or anti-parallel to the FR axis, we observe a different conversion efficiency of two right (left) circularly polarized photons into a frequency-doubled left (right) circularly polarized photon. Our work uncovers a fundamentally new optical effect in ordered solids and opens up the possibility for developing novel nonlinear and directionally asymmetric optical devices. |
| title | Directionally asymmetric nonlinear optics in planar chiral MnTiO$_3$ |
| topic | Optics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2410.18086 |