Honeycomb Electron Lattice Induced Dirac Fermion with Trigonal Warping in Bilayer Electrides

Author:

Meng Weizhen12ORCID,Wu Hongbo1,Jiao Yalong1,Ma Fengxian1,Wang Shiyao34,Liu Ying2,Liu Guodong2,Zhang Xiaoming2

Affiliation:

1. College of Physics Hebei Key Laboratory of Photophysics Research and Application Hebei Normal University Shijiazhuang 050024 China

2. State Key Laboratory of Reliability and Intelligence of Electrical Equipment and School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China

3. State Key Laboratory of Solidification Processing School of Materials Science and Engineering Department Northwestern Polytechnical University Shannxi 710072 China

4. Materials Research Center for Element Strategy Tokyo Institute of Technology Yokohama 226–8503 Japan

Abstract

AbstractEmergent fermions arising from the excess electrons of electrides provide a new perspective for exploring semimetal states with unique Fermi surface geometries. In this study, a class of unique two‐dimensional (2D) highly anisotropic Dirac fermions is designed using a sandwich structure. Based on the structural design and first‐principles calculations, 2D electride MB (M = Ca/Sr, B = Cl/Br/I) is an ideal candidate material. The excess electrons of the bilayer MB could be stably localized in the interstitial cavities, constructing a natural zigzag honeycomb electron sublattice that further forms a Dirac fermion. Compared with traditional Dirac semimetals, 2D Dirac electrides exhibited rich physical properties: i) The Fermi surface shows trigonal warping in low‐energy regions. In particular, the geometry of the Fermi surface determines the high anisotropy of the Fermi velocity. ii) A pair of Dirac fermions are protected by three‐fold rotational symmetry and exhibit strong robustness. iii) Electride MB possesses a lower work function that strongly correlates with the surface area of the emission channel. Based on these properties, an electron‐emitting device with multifunctional applications is fabricated. Therefore, this study provides an ideal platform for studying potential entanglement between structures, electrides, and topological states.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Hebei Province

Hebei Normal University of Science and Technology

Hebei Provincial Department of Science and Technology

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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