Uncovering the Hidden Ferroaxial Density Wave as the Origin of the Axial Higgs Mode in RTe$_3$
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Singh, Birender McNamara, Grant Kim, Kyung-Mo Siddique, Saif Funni, Stephen D. Zhang, Weizhe Luo, Xiangpeng Sakrikar, Piyush Kenney, Eric M. Singha, Ratnadwip Alekseev, Sergey Ghorashi, Sayed Ali Akbar Hicken, Thomas J. Baines, Christopher Luetkens, Hubertus Wang, Yiping Plisson, Vincent M. Geiwitz, Michael Occhialini, Connor A. Comin, Riccardo Graf, Michael J. Zhao, Liuyan Cano, Jennifer Fernandes, Rafael M. Cha, Judy J. Schoop, Leslie M. Burch, Kenneth S. |
| author_facet | Singh, Birender McNamara, Grant Kim, Kyung-Mo Siddique, Saif Funni, Stephen D. Zhang, Weizhe Luo, Xiangpeng Sakrikar, Piyush Kenney, Eric M. Singha, Ratnadwip Alekseev, Sergey Ghorashi, Sayed Ali Akbar Hicken, Thomas J. Baines, Christopher Luetkens, Hubertus Wang, Yiping Plisson, Vincent M. Geiwitz, Michael Occhialini, Connor A. Comin, Riccardo Graf, Michael J. Zhao, Liuyan Cano, Jennifer Fernandes, Rafael M. Cha, Judy J. Schoop, Leslie M. Burch, Kenneth S. |
| contents | The recent discovery of an axial amplitude (Higgs) mode in the long-studied charge density wave (CDW) systems GdTe$_3$ and LaTe$_3$ suggests a heretofore unidentified hidden order. A theoretical study proposed that the axial Higgs results from a hidden ferroaxial component of the CDW, which could arise from non-trivial orbital texture. Here, we report extensive experimental studies on ErTe$_3$ and HoTe$_3$ that possess a high-temperature CDW similar to other RTe$_3$ (R = rare earth), along with an additional low-temperature CDW with an orthogonal ordering vector. Combining Raman spectroscopy with large-angle convergent beam electron diffraction (LACBED), rotational anisotropy second-harmonic generation (RA-SHG), and muon-spin relaxation ($μ$SR), we provide unambiguous evidence that the high-temperature CDW breaks translation, rotation, and all vertical and diagonal mirror symmetries, but not time-reversal or inversion. In contrast, the low-temperature CDW only additionally breaks translation symmetry. Simultaneously, Raman scattering shows the high-temperature CDW produces an axial Higgs mode while the low-temperature mode is scalar. The weak monoclinic structural distortion and clear axial response in Raman and SHG are consistent with a ferroaxial phase in RTe$_3$ driven by coupled orbital and charge orders. Thus, our study provides a new standard for uncovering unconventional orders and confirms the power of Higgs modes to reveal them. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_08322 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Uncovering the Hidden Ferroaxial Density Wave as the Origin of the Axial Higgs Mode in RTe$_3$ Singh, Birender McNamara, Grant Kim, Kyung-Mo Siddique, Saif Funni, Stephen D. Zhang, Weizhe Luo, Xiangpeng Sakrikar, Piyush Kenney, Eric M. Singha, Ratnadwip Alekseev, Sergey Ghorashi, Sayed Ali Akbar Hicken, Thomas J. Baines, Christopher Luetkens, Hubertus Wang, Yiping Plisson, Vincent M. Geiwitz, Michael Occhialini, Connor A. Comin, Riccardo Graf, Michael J. Zhao, Liuyan Cano, Jennifer Fernandes, Rafael M. Cha, Judy J. Schoop, Leslie M. Burch, Kenneth S. Strongly Correlated Electrons The recent discovery of an axial amplitude (Higgs) mode in the long-studied charge density wave (CDW) systems GdTe$_3$ and LaTe$_3$ suggests a heretofore unidentified hidden order. A theoretical study proposed that the axial Higgs results from a hidden ferroaxial component of the CDW, which could arise from non-trivial orbital texture. Here, we report extensive experimental studies on ErTe$_3$ and HoTe$_3$ that possess a high-temperature CDW similar to other RTe$_3$ (R = rare earth), along with an additional low-temperature CDW with an orthogonal ordering vector. Combining Raman spectroscopy with large-angle convergent beam electron diffraction (LACBED), rotational anisotropy second-harmonic generation (RA-SHG), and muon-spin relaxation ($μ$SR), we provide unambiguous evidence that the high-temperature CDW breaks translation, rotation, and all vertical and diagonal mirror symmetries, but not time-reversal or inversion. In contrast, the low-temperature CDW only additionally breaks translation symmetry. Simultaneously, Raman scattering shows the high-temperature CDW produces an axial Higgs mode while the low-temperature mode is scalar. The weak monoclinic structural distortion and clear axial response in Raman and SHG are consistent with a ferroaxial phase in RTe$_3$ driven by coupled orbital and charge orders. Thus, our study provides a new standard for uncovering unconventional orders and confirms the power of Higgs modes to reveal them. |
| title | Uncovering the Hidden Ferroaxial Density Wave as the Origin of the Axial Higgs Mode in RTe$_3$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2411.08322 |