Fig. 2: Helium platelets in diamond.
From: Creating two-dimensional solid helium via diamond lattice confinement
Large-field-of-view iDPC STEM images under the a [011] and b [001] zone axes illustrate helium platelets in diamond. c Atomic structural model of {100} two-dimensional solid helium confined by the diamond lattice. d Atomic positions of two-dimensional solid helium in the unit cell, which has the dimensions of a = 2.52 Å, b = 2.52 Å and c = 14.25 Å.
