Semi-Dirac Fermions in a Topological Metal
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| Autores principales: | , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| author | Shao, Yinming Moon, Seongphill Rudenko, A. N. Wang, Jie Herzog-Arbeitman, Jonah Ozerov, Mykhaylo Graf, David Sun, Zhiyuan Queiroz, Raquel Lee, Seng Huat Zhu, Yanglin Mao, Zhiqiang Katsnelson, M. I. Bernevig, B. Andrei Smirnov, Dmitry Millis, Andrew. J. Basov, D. N. |
| author_facet | Shao, Yinming Moon, Seongphill Rudenko, A. N. Wang, Jie Herzog-Arbeitman, Jonah Ozerov, Mykhaylo Graf, David Sun, Zhiyuan Queiroz, Raquel Lee, Seng Huat Zhu, Yanglin Mao, Zhiqiang Katsnelson, M. I. Bernevig, B. Andrei Smirnov, Dmitry Millis, Andrew. J. Basov, D. N. |
| contents | Topological semimetals with massless Dirac and Weyl fermions represent the forefront of quantum materials research. In two dimensions (2D), a peculiar class of fermions that are massless in one direction and massive in the perpendicular direction was predicted sixteen years ago. These highly exotic quasiparticles - the semi-Dirac fermions - ignited intense theoretical and experimental interest but remain undetected. Using magneto-optical spectroscopy, we demonstrate the defining feature of semi-Dirac fermions - $B^{2/3}$ scaling of Landau levels - in a prototypical nodal-line metal ZrSiS. In topological metals, including ZrSiS, nodal-lines extend the band degeneracies from isolated points to lines, loops or even chains in the momentum space. With $\textit{ab initio}$ calculations and theoretical modeling, we pinpoint the observed semi-Dirac spectrum to the crossing points of nodal-lines in ZrSiS. Crossing nodal-lines exhibit a continuum absorption spectrum but with singularities that scale as $B^{2/3}$ at the crossing. Our work sheds light on the hidden quasiparticles emerging from the intricate topology of crossing nodal-lines and highlights the potential to explore quantum geometry with linear optical responses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_03735 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Semi-Dirac Fermions in a Topological Metal Shao, Yinming Moon, Seongphill Rudenko, A. N. Wang, Jie Herzog-Arbeitman, Jonah Ozerov, Mykhaylo Graf, David Sun, Zhiyuan Queiroz, Raquel Lee, Seng Huat Zhu, Yanglin Mao, Zhiqiang Katsnelson, M. I. Bernevig, B. Andrei Smirnov, Dmitry Millis, Andrew. J. Basov, D. N. Materials Science Mesoscale and Nanoscale Physics Topological semimetals with massless Dirac and Weyl fermions represent the forefront of quantum materials research. In two dimensions (2D), a peculiar class of fermions that are massless in one direction and massive in the perpendicular direction was predicted sixteen years ago. These highly exotic quasiparticles - the semi-Dirac fermions - ignited intense theoretical and experimental interest but remain undetected. Using magneto-optical spectroscopy, we demonstrate the defining feature of semi-Dirac fermions - $B^{2/3}$ scaling of Landau levels - in a prototypical nodal-line metal ZrSiS. In topological metals, including ZrSiS, nodal-lines extend the band degeneracies from isolated points to lines, loops or even chains in the momentum space. With $\textit{ab initio}$ calculations and theoretical modeling, we pinpoint the observed semi-Dirac spectrum to the crossing points of nodal-lines in ZrSiS. Crossing nodal-lines exhibit a continuum absorption spectrum but with singularities that scale as $B^{2/3}$ at the crossing. Our work sheds light on the hidden quasiparticles emerging from the intricate topology of crossing nodal-lines and highlights the potential to explore quantum geometry with linear optical responses. |
| title | Semi-Dirac Fermions in a Topological Metal |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2311.03735 |