Gordillo, M.C.Ceperley, D. M.2014-06-252014-06-251997-10Physical Review Letters, 1997;79(16):3010-30130031-9007http://hdl.handle.net/10433/978Path integral Monte Carlo calculations were used to study a 2D system of H2 molecules. The ground state on a flat substrate is a triangular lattice, a localized solid. We find that the introduction of some weakly attractive impurities (specifically alkali metal atoms) in the right concentration (~0.01¿¿2) stabilizes a liquid hydrogen phase of concentration 0.04¿¿2 which undergoes a Kosterlitz-Thouless superfluid transition below approximately 1.2 K.application/pdfenAmerican Physical SocietyMonte Carlo calculationsSuperfluidityjournal articleopen access