## What is/are Two Dimensional Honeycomb?

Two Dimensional Honeycomb - The Al(111) substrate donates electrons to the pre-covered two-dimensional honeycomb borophene (h-B) to stabilize the latter, and the deposited TM atoms further provide electrons to the h-B, enhancing the covalent binding between the h-B and the Al(111) substrate.^{[1]}The thermoelectric performance of the materials, which is of great interest for the waste heat recovery and solid-state cooling, is determined by figure of merit or the ZT for the two-dimensional honeycomb lattices GeC, SnC and SiC.

^{[2]}In this paper, a damped rail with two-dimensional honeycomb PCs was proposed, and its band structure was analysed with FEM.

^{[3]}We grow wafers by metal-organic vapor phase epitaxy and process arrays into a unique two-dimensional honeycomb geometry with top mesa inter-VCSEL ridge connectors and p-metal anode interconnections.

^{[4]}Two-dimensional honeycomb crystals have inspired intense research interest for their novel properties and great potential in electronics and optoelectronics.

^{[5]}We develop a phonon-magnon interaction model for the two-dimensional honeycomb ferromagnet and calculate the band structure of the hybrid phonon-magnon excitation.

^{[6]}The transformation of the stripe domain structure of spontaneously-formed epitaxial silicene on ZrB2 thin films into a single-domain driven by the adsorption of a fraction of a monolayer of silicon was used to investigate how dislocations react and eventually annihilate in a two-dimensional honeycomb structure.

^{[7]}In this work, we investigate a two-dimensional honeycomb photonic crystal (2D HPC) with $${C}_{6}$$ symmetry point group, which is known to demonstrate a double Dirac cone at high symmetry point of the Brillion zone.

^{[8]}It is found that the two-dimensional honeycomb optical lattices admit multipole gap solitons.

^{[9]}Graphene (Gr) is a monolayer of carbon atoms in a two-dimensional honeycomb lattice, and has derivatives of graphene oxide and reduced graphene oxide.

^{[10]}Following their evolution with electric field, it is revealed that, at very small fields, these eight states are very broad, spin-locked, and sublattice constrained, inheriting their properties from the K and K′ states in a silicene two-dimensional honeycomb lattice.

^{[11]}Graphene, as a material with a single-layer two-dimensional honeycomb lattice carbon chain structure, has good electrical conductivity.

^{[12]}Recently, a new type of second-order topological insulator has been theoretically proposed by introducing an in-plane Zeeman field into the Kane-Mele model in the two-dimensional honeycomb lattice.

^{[13]}Two-dimensional honeycomb molecular networks confine a substrate’s surface electrons within their pores, providing an ideal playground to investigate the quantum electron scattering phenomena.

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## density functional theory

We have studied the valence effects on the stability of Stone–Wales (SW) defect in some typical two-dimensional honeycomb crystals containing group-IV, V, and VI elements employing density functional theory.^{[1]}The structural, electronic, and optical properties of optimized Fe, Co, Ni and Cu doped ZnO monolayer in a two-dimensional honeycomb structure are analyzed based on the density functional theory.

^{[2]}In this work, the lattice thermal conductivity of two-dimensional honeycomb structures of BN, AlN, and GaN studied using first-principles density functional theory and solving the linearized Boltzmann transport equation by relaxation time approximation.

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