P -Band Engineering in Artificial Electronic Lattices

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Abstract

Artificial electronic lattices, created atom by atom in a scanning tunneling microscope, have emerged as a highly tunable platform to realize and characterize the lowest-energy bands of novel lattice geometries. Here, we show that artificial electronic lattices can be tailored to exhibit higher-energy bands. We study p-like bands in fourfold and threefold rotationally symmetric lattices. In addition, we show how an anisotropic design can be used to lift the degeneracy between px- and py-like bands. The experimental measurements are corroborated by muffin-tin and tight-binding calculations. The approach to engineer higher-energy electronic bands in artificial quantum systems introduced here enables the realization of complex band structures from the bottom up.

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Slot, M. R., Kempkes, S. N., Knol, E. J., Van Weerdenburg, W. M. J., Van Den Broeke, J. J., Wegner, D., … Swart, I. (2019). P -Band Engineering in Artificial Electronic Lattices. Physical Review X, 9(1). https://doi.org/10.1103/PhysRevX.9.011009

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