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arXiv · 2106.07685

A Perspective on Collective Properties of Atoms on 2D Materials

Adrian Del Maestro·Carlos Wexler·Juan M. Vanegas·Taras Lakoba·Valeri N. Kotov
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Abstract

Atoms deposited on two-dimensional (2D) electronic materials, such as graphene, can exhibit unconventional many-body correlations, not accessible in other settings. All of these are driven by van der Waals forces: between the atoms themselves and atom-material interactions. For example $^4$He atoms on 2D materials can potentially form a variety of exotic quantum states of matter, such as two-dimensional supersolids and superfluids, in addition to solid phases. For the "most quantum" case of a single helium layer we discuss, from a theoretical perspective, how the effective low-energy (Bose-Hubbard) description can take advantage of the extreme sensitivity of this unique system to the interplay between the atomic (helium) and solid-state (graphene) components. Due to the extraordinary variety and tunability of 2D electronic materials, we envisage that a wide range of correlated atomic phases can be realized under favorable conditions. We also outline exciting possibilities in the opposite extreme of many atomic layers forming a liquid on top of graphene -- in this case a so-called "spinodal de-wetting" pattern can form at the liquid-vapor interface which reflects the presence and electronic properties of graphene underneath. Such patterns could be manipulated by choosing different atoms and materials, with potential technological applications.

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Adrian Del Maestro, Carlos Wexler, Juan M. Vanegas, Taras Lakoba, Valeri N. Kotov. 2021-06-14. A Perspective on Collective Properties of Atoms on 2D Materials. https://doi.org/10.1002/aelm.202100607

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