It further confirms that the helium platelet was confined by the surrounding diamond lattice.
An edge is visible at ~25.0 eV from the helium platelet that can be attributed to the combination of helium K-edge and platelet-enhanced surface plasmon of the crystalline diamond. Furthermore, we performed spatially resolved electron-energy loss spectroscopy (EELS) measurements on a helium platelet and compared it with the spectrum taken from the adjacent matrix (see Fig. Figure 1e shows helium platelets with a darker contrast in the diamond specimen because of the relatively low atomic number of helium. Controllable ion implantation enables the self-assembly of monolayer helium atoms between helium platelets was also supported by high-angle annular dark-field (HAADF) STEM imaging. Here we report the discovery of room-temperature two-dimensional solid helium through the diamond lattice confinement effect.
However, it is challenging to produce, observe and utilize solid helium on the earth because high-pressure techniques are required to solidify helium. Therefore, exploring the allotropes of helium remains vital to our understanding of nature. The universe abounds with solid helium in polymorphic forms.
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