Magnetic Ordering, Anomalous Lifshitz Transition and Topological Grain Boundaries in Two-Dimensional Biphenylene Network

Abstract

We study electronic properties of a new planar carbon crystal formed through networking biphenylene molecules. Novel electronic features among carbon materials such as zone-center saddle point and peculiar type-II Dirac fermionic states are shown to exist in the low energy electronic spectrum. The type-II state here has a nearly flat branch and is close to a transition to type-I. Possible magnetic instabilities related with low energy bands are discussed. Furthermore, with a moderate uniaxial strain, a pair of Dirac points merge with the zone center saddle point, realizing concurrent Lifshitz transitions of van Hove singularity as well as pair annihilation of the Dirac fermions. A new effective Hamiltonian encompassing all distinctive low energy states is constructed, revealing a finite winding number of the pseudo-spin texture around the Dirac point, quantized Zak phases, and topological grain boundary states.

arXiv commenttitle changed, references updated, 6 pages

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Cited by in corpus (6)

• Topological Edge and Corner States in Biphenylene Network
• Robustness of type-II Dirac cones in biphenylene-based structures
• Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice
• Sliding-induced topological transitions in bilayer biphenylene
• Topological and superconducting properties of two-dimensional C6-2x(BN)x biphenylene network: a first-principles investigation
• DFT+U+V Study of Magnetic Ordering in Single-Layer Pentahexoctite: Implications for Magnetic Device Platforms