Discovery of 2D Anisotropic Dirac Cones

Baojie Feng; Jin Zhang; Suguru Ito; Masashi Arita; Cai Cheng; Lan Chen; Kehui Wu; Fumio Komori; Osamu Sugino; Koji Miyamoto; Taichi Okuda; Sheng Meng; Iwao Matsuda

doi:10.1002/adma.201704025

Discovery of 2D Anisotropic Dirac Cones

Adv Mater. 2018 Jan;30(2). doi: 10.1002/adma.201704025. Epub 2017 Nov 24.

Authors

Baojie Feng^{1

2}, Jin Zhang³, Suguru Ito², Masashi Arita¹, Cai Cheng³, Lan Chen³, Kehui Wu³, Fumio Komori², Osamu Sugino², Koji Miyamoto¹, Taichi Okuda¹, Sheng Meng³, Iwao Matsuda²

Affiliations

¹ Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan.
² Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan.
³ Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.

PMID: 29171690
DOI: 10.1002/adma.201704025

Abstract

2D anisotropic Dirac cones are observed in χ₃ borophene, a monolayer boron sheet, using high-resolution angle-resolved photoemission spectroscopy. The Dirac cones are centered at the X and X' points. The data also reveal that the hybridization between borophene and Ag(111) is very weak, which explains the preservation of the Dirac cones. As χ₃ borophene has been predicated to be a superconductor, the results may stimulate further research interest in the novel physics of borophene, such as the interplay between Cooper pairs and the massless Dirac fermions.

Keywords: Dirac cone; angle-resolved photoemission spectroscopy; anisotropic; borophene; first-principles calculations.