Two-dimensional Weyl and type-III Dirac semimetals in BaCu monolayer and twisted α/β-BaCu/BN systems

BaCu monolayer

Figure 1a, b illustrates the crystal structure of the single-layer BaCu in side and top views. The monolayer has a lattice constant of a = b ≈ 4.33 Å and belongs to the P6/mmm space group (SG.191), corresponding to the…

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