Thin $$^4$$He Films on Alkali Substrates: Where Do $$^3$$He Atoms Bind?

The possible occurrence of bound states $$^3$$ He atoms in the vicinity a weakly attractive substrate coated with thin superfluid $$^4$$ film is investigated by first principle computer simulations. No evidence seen such states, even case weakest substrate, i.e., Cs; single atom always binds to free surface, regardless thickness film. A comparison density profiles computed this work those yielded Density Functional approach that led prediction near shows latter may not have afforded sufficiently accurate structural description adsorbed