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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.09153 |
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| _version_ | 1866917720777293824 |
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| author | Lim, Chan-young Kim, Min-Seok Lim, Dong Cheol Kim, Sunghun Lee, Yeonghoon Cha, Jaehoon Lee, Gyubin Song, Sang Yong Thapa, Dinesh Denlinger, Jonathan D. Kim, Seong-Gon Kim, Sung Wng Seo, Jungpil Kim, Yeongkwan |
| author_facet | Lim, Chan-young Kim, Min-Seok Lim, Dong Cheol Kim, Sunghun Lee, Yeonghoon Cha, Jaehoon Lee, Gyubin Song, Sang Yong Thapa, Dinesh Denlinger, Jonathan D. Kim, Seong-Gon Kim, Sung Wng Seo, Jungpil Kim, Yeongkwan |
| contents | Two-dimensional electrides can acquire topologically non-trivial phases due to intriguing interplay between the cationic atomic layers and anionic electron layers. However, experimental evidence of topological surface states has yet to be verified. Here, via angle-resolved photoemission spectroscopy (ARPES) and scanning tunnelling microscopy (STM), we probe the magnetic Weyl states of the ferromagnetic electride $[Gd_{2}$C]^{2+}\cdot2e^{-}$. In particular, the presence of Weyl cones and Fermi-arc states is demonstrated through photon energy-dependent ARPES measurements, agreeing with theoretical band structure calculations. Notably, the STM measurements reveal that the Fermi-arc states exist underneath a floating quantum electron liquid on the top Gd layer, forming double-stacked surface states in a heterostructure. Our work thus not only unveils the non-trivial topology of the $[Gd_{2}$C]^{2+}\cdot2e^{-}$ electride but also realizes a surface heterostructure that can host phenomena distinct from the bulk. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_09153 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Topological Fermi-arc surface state covered by floating electrons on a two-dimensional electride Lim, Chan-young Kim, Min-Seok Lim, Dong Cheol Kim, Sunghun Lee, Yeonghoon Cha, Jaehoon Lee, Gyubin Song, Sang Yong Thapa, Dinesh Denlinger, Jonathan D. Kim, Seong-Gon Kim, Sung Wng Seo, Jungpil Kim, Yeongkwan Materials Science Two-dimensional electrides can acquire topologically non-trivial phases due to intriguing interplay between the cationic atomic layers and anionic electron layers. However, experimental evidence of topological surface states has yet to be verified. Here, via angle-resolved photoemission spectroscopy (ARPES) and scanning tunnelling microscopy (STM), we probe the magnetic Weyl states of the ferromagnetic electride $[Gd_{2}$C]^{2+}\cdot2e^{-}$. In particular, the presence of Weyl cones and Fermi-arc states is demonstrated through photon energy-dependent ARPES measurements, agreeing with theoretical band structure calculations. Notably, the STM measurements reveal that the Fermi-arc states exist underneath a floating quantum electron liquid on the top Gd layer, forming double-stacked surface states in a heterostructure. Our work thus not only unveils the non-trivial topology of the $[Gd_{2}$C]^{2+}\cdot2e^{-}$ electride but also realizes a surface heterostructure that can host phenomena distinct from the bulk. |
| title | Topological Fermi-arc surface state covered by floating electrons on a two-dimensional electride |
| topic | Materials Science |
| url | https://arxiv.org/abs/2407.09153 |