Realization of a two-dimensional checkerboard lattice in monolayer Cu${}_2$N

Abstract

Two-dimensional checkerboard lattice, the simplest line-graph lattice, has been intensively studied as a toy model, while material design and synthesis remain elusive. Here, we report theoretical prediction and experimental realization of the checkerboard lattice in monolayer Cu${}_2$N. Experimentally, monolayer Cu${}_2$N can be realized in the well-known N/Cu(100) and N/Cu(111) systems that were previously mistakenly believed to be insulators. Combined angle-resolved photoemission spectroscopy measurements, first-principles calculations, and tight-binding analysis show that both systems host checkerboard-derived hole pockets near the Fermi level. In addition, monolayer Cu${}_2$N has outstanding stability in air and organic solvents, which is crucial for further device applications.

arXiv commentNano Letters, in press

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• Competition between $d$-wave and $d$+$is$-wave superconductivity in the Hubbard model on a checkerboard lattice
• Unconventional Fractional Phases in Multi-Band Vortexable Systems