One might have thought that only carbon with it's stable sp2 bonds is the only way to get a honeycomb lattice. Observations dating back to 1934 show otherwise. Helium is more like carbon than people generally believe. Aren't self organizing crystals wonderful? I save this abstract to remind myself to buy the article if I am ever rich enough. One pays taxes all ones life, but cannot even read the fruit of the research one is paying for.
Phys. Rev. Lett. 42, 795–798 (1979)
Evidence for a Liquid-to-Crystal Phase Transition in a Classical, Two-Dimensional Sheet of Electrons
Received 17 January 1979; published in the issue dated 19 March 1979
Experimental evidence is presented for an electron-liquid to electron-crystal phase transition in a sheet of electrons on a liquid-He surface. The phase transition has been studied for electron areal densities from 3×108 cm-2 to 9×108cm-2 and has yielded melting temperatures between 0.35 and 0.65 K. The phase transition occurs at Γ=137±15, where Γ is a measure of the ratio of potential energy to kinetic energy per electron.
© 1979 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.42.795
DOI:
10.1103/PhysRevLett.42.795
PACS:
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