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A nanotent is a protrusion in a single layer of graphene or hexagonal boron nitride on a transition metal, which is formed by atoms upon implantation between the single layer (rainfly) and the substrate. It was first reported by the Surface Physics group at the University of Zurich (Cun et al. NanoLetters 13, 2098 (2013)) (article).

Three dimensional representation of a scanning tunneling microscopy image of a nanotent housing argon at room temperature. The blue regions, separated by 3.2 nm, correspond to the pores in the h-BN nanomesh substrate.

See movies of the Ar insertion.