Solid argon as a possible substrate for quasi-freestanding silicene
  We study the structural and electronic properties of silicene on solid Ar(111) substrate using ab-initio calculations. We demonstrate that due to weak interaction quasi-freestanding silicene is realized in this system. The small binding energy of only $-32$ meV per Si atom also indicates the possibility to separate silicene from the solid Ar(111) substrate. In addition, a band gap of $11$ meV and a significant splitting of the energy levels due to spin-orbit coupling are observed. 
S. Sattar, R. Hoffmann and U. Schwingenschl\"ogl
cond-mat.mes-hall cond-mat.mtrl-sci