Spin-polarized hydrogen adsorbed on the surface of superfluid 4He

Abstract

The experimental realization of a thin layer of spin-polarized hydrogen H↓ adsorbed on top of the surface of superfluid 4 He provides one of the best examples of a stable, nearly two-dimensional (2D) quantum Bose gas. We report a theoretical study of this system using quantum Monte Carlo methods in the limit of zero temperature. Using the full Hamiltonian of the system, composed of a superfluid 4 He slab and the adsorbed H↓ layer, we calculate the main properties of its ground state using accurate models for the pair interatomic potentials. Comparing the results for the layer with the ones obtained for a strictly 2D setup, we analyze the departure from the 2D character when the density increases. Only when the coverage is rather small the use of a purely 2D model is justified. The condensate fraction of the layer is significantly larger than in 2D at the same surface density, being as large as 60% at the largest coverage studied. © 2013 AIP Publishing LLC.

Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

“…The heavier mass of the tritium reduces the zero-point motion and opens up the possibility of forming a liquid a low temperatures. Thin films of superfluid spin-polarized tritium adsorbed onto the surface of superfluid 4 He may be a suitable target for the PTOLEMY experiment that aims to detect and measure the anisotropies of the CνB [11,12].…”

Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

“…The heavier mass of the tritium reduces the zero-point motion and opens up the possibility of forming a liquid a low temperatures. Thin films of superfluid spin-polarized tritium adsorbed onto the surface of superfluid 4 He may be a suitable target for the PTOLEMY experiment that aims to detect and measure the anisotropies of the CνB [10,11].…”