Fig. 4: P-T domain of three-and two-dimensional solid helium.
From: Creating two-dimensional solid helium via diamond lattice confinement
Helium was first solidified by Keesom8 in 1926. With the development of high-pressure techniques9,10,11,37, three-dimensional solid helium has been obtained at high P-T conditions. Nevertheless, two-dimensional solid helium has previously been achieved by physisorption on the surface of graphite at low temperatures17,18,19. Using diamond lattice confinement, we substantially extended the P-T domain of two-dimensional solid helium for potential practical applications. Source data are provided as a Source Data file.
