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Title: Type-II Dirac cones and electron-phonon interaction in monolayer biphenylene from first-principles calculations

Journal Article · · Physical Review B
ORCiD logo [1]; ORCiD logo [2];  [3];  [1];  [1];  [4]; ORCiD logo [5];  [6]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Spallation Neutron Source Science Center, Dongguan (China)
  2. Chinese Academy of Sciences (CAS), Hefei (China); Foshan (Southern China) Institute for New Materials, Guangdong (China)
  3. Henan University of Technology, Zhengzhou (China)
  4. Qufu Normal University (China); Inst. of Applied Physics and Computational Mathematics (IAPCM), Beijing (China)
  5. Chinese Academy of Sciences (CAS), Beijing (China); Spallation Neutron Source Science Center, Dongguan (China); Shanxi University (China)
  6. Univ. of Missouri, Columbia, MO (United States)

In this work, we report a first-principles investigation of electronic structure, topological bands, and electron-phonon interactions in metallic biphenylene sheets. Biphenylene is a recently synthesized sp2-bonded carbon allotrope. We find coupling of electrons at the Fermi surface to very high frequency carbon-derived phonons, analogous to superconducting MgB2. This leads to low-temperature weak coupling superconductivity due to an unusual combination of exceptionally large logarithmically averaged phonon frequency ωlog=1369 K and moderate electron-phonon coupling. The electronic structure shows a two-band Fermi surface dominated by C pz orbitals and a pair of type-II tilted Dirac cones along the Γ-Y line at the Brillouin zone boundary. Berry curvature and edge-state calculations show that monolayer biphenylene is a two-dimensional $$\mathbb{Z}$$2 topological material. Thus, monolayer biphenylene is predicted to be a topological superconductor based on C p orbitals and high-frequency phonons.

Research Organization:
Univ. of Missouri, Columbia, MO (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China (NSFC); Foshan Institute for New Materials; Key Scientific and Technological Project of Henan Province; Henan University of Technology
Grant/Contract Number:
SC0019114; 12074381; 12005230; 12104458; 12074241; 2021AYF25021; 212102210577; 31401129
OSTI ID:
1836234
Journal Information:
Physical Review B, Vol. 104, Issue 23; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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