Visualizing higher-fold topology in chiral crystals
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2020
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| _version_ | 1866916817570627584 |
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| author | Cochran, Tyler A Belopolski, Ilya Manna, Kaustuv Yahyavi, Mohammad Liu, Yiyuan Sanchez, Daniel S. Cheng, Zi-Jia Yang, Xian P. Multer, Daniel Yin, Jia-Xin Borrmann, Horst Chikina, Alla Krieger, Jonas A. Sánchez-Barriga, Jaime Fèvre, Patrick Le Bertran, François Strocov, Vladimir N. Denlinger, Jonathan D. Chang, Tay-Rong Jia, Shuang Felser, Claudia Lin, Hsin Chang, Guoqing Hasan, M. Zahid |
| author_facet | Cochran, Tyler A Belopolski, Ilya Manna, Kaustuv Yahyavi, Mohammad Liu, Yiyuan Sanchez, Daniel S. Cheng, Zi-Jia Yang, Xian P. Multer, Daniel Yin, Jia-Xin Borrmann, Horst Chikina, Alla Krieger, Jonas A. Sánchez-Barriga, Jaime Fèvre, Patrick Le Bertran, François Strocov, Vladimir N. Denlinger, Jonathan D. Chang, Tay-Rong Jia, Shuang Felser, Claudia Lin, Hsin Chang, Guoqing Hasan, M. Zahid |
| contents | Novel topological phases of matter are fruitful platforms for the discovery of unconventional electromagnetic phenomena. Higher-fold topology is one example, where the low-energy description goes beyond Standard Model analogs. Despite intensive experimental studies, conclusive evidence remains elusive for the \textit{multi-gap topological nature of higher-fold chiral fermions}. In this Letter, we leverage a combination of fine-tuned chemical engineering and photoemission spectroscopy with photon energy contrast to discover the higher-fold topology of a chiral crystal. We identify all bulk branches of a higher-fold chiral fermion for the first time, critically important for allowing us to explore unique Fermi arc surface states in multiple inter-band gaps, which exhibit an emergent ladder structure. Through designer chemical gating of the samples in combination with our measurements, we uncover an unprecedented multi-gap bulk boundary correspondence. Our demonstration of multi-gap electronic topology will propel future research on unconventional topological responses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2004_11365 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Visualizing higher-fold topology in chiral crystals Cochran, Tyler A Belopolski, Ilya Manna, Kaustuv Yahyavi, Mohammad Liu, Yiyuan Sanchez, Daniel S. Cheng, Zi-Jia Yang, Xian P. Multer, Daniel Yin, Jia-Xin Borrmann, Horst Chikina, Alla Krieger, Jonas A. Sánchez-Barriga, Jaime Fèvre, Patrick Le Bertran, François Strocov, Vladimir N. Denlinger, Jonathan D. Chang, Tay-Rong Jia, Shuang Felser, Claudia Lin, Hsin Chang, Guoqing Hasan, M. Zahid Materials Science Mesoscale and Nanoscale Physics Novel topological phases of matter are fruitful platforms for the discovery of unconventional electromagnetic phenomena. Higher-fold topology is one example, where the low-energy description goes beyond Standard Model analogs. Despite intensive experimental studies, conclusive evidence remains elusive for the \textit{multi-gap topological nature of higher-fold chiral fermions}. In this Letter, we leverage a combination of fine-tuned chemical engineering and photoemission spectroscopy with photon energy contrast to discover the higher-fold topology of a chiral crystal. We identify all bulk branches of a higher-fold chiral fermion for the first time, critically important for allowing us to explore unique Fermi arc surface states in multiple inter-band gaps, which exhibit an emergent ladder structure. Through designer chemical gating of the samples in combination with our measurements, we uncover an unprecedented multi-gap bulk boundary correspondence. Our demonstration of multi-gap electronic topology will propel future research on unconventional topological responses. |
| title | Visualizing higher-fold topology in chiral crystals |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2004.11365 |