Topological Fermi-arc surface state covered by floating electrons on a two-dimensional electride

Chan-young Lim, Min-Seok Kim, Dong Cheol Lim, Sunghun Kim, Yeonghoon Lee, Jaehoon Cha, Gyubin Lee, Sang Yong Song, Dinesh Thapa, Jonathan D. Denlinger, Seong-Gon Kim (), Sung Wng Kim (), Jungpil Seo () and Yeongkwan Kim ()
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Chan-young Lim: Korea Advanced Institute of Science and Technology
Min-Seok Kim: Daegu Gyeongbuk Institute of Science and Technology
Dong Cheol Lim: Sungkyunkwan University
Sunghun Kim: Ajou University
Yeonghoon Lee: Korea Research Institute of Standards and Science
Jaehoon Cha: Korea Advanced Institute of Science and Technology
Gyubin Lee: Korea Advanced Institute of Science and Technology
Sang Yong Song: Daegu Gyeongbuk Institute of Science and Technology
Dinesh Thapa: North Dakota State University
Jonathan D. Denlinger: Lawrence Berkeley National Laboratory
Seong-Gon Kim: Mississippi State University
Sung Wng Kim: Sungkyunkwan University
Jungpil Seo: Daegu Gyeongbuk Institute of Science and Technology
Yeongkwan Kim: Korea Advanced Institute of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract 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 [Gd2C]2+·2e−. 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 [Gd2C]2+·2e− electride but also realizes a surface heterostructure that can host phenomena distinct from the bulk.

Date: 2024
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DOI: 10.1038/s41467-024-49841-6

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