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High pressure chemistry is known to inspire the creation of unexpected newclasses of compounds with exceptional properties. Here we report the synthesisat ~90 GPa of novel beryllium polynitrides, monoclinic and triclinic BeN4. Thetriclinic phase, upon decompression to ambient conditions, transforms into acompound with atomic-thick BeN4 layers interconnected via weak van der Waalsbonds consisting of polyacetylene-like nitrogen chains with conjugated{\pi}-systems and Be atoms in square-planar coordination. Theoreticalcalculations for a single BeN4 layer show that its electronic lattice isdescribed by a slightly distorted honeycomb structure reminiscent of thegraphene lattice and the presence of Dirac points in the electronic bandstructure at the Fermi level. The BeN4 layer, i.e. beryllonitrene, represents aqualitatively new class of 2D materials that can be built of a metal atom andpolymeric nitrogen chains and host anisotropic Dirac fermions.

High-pressure synthesis of Dirac materials: layered van der Waals bonded BeN$_4$ polymorph