Explanation of 100-fold reduction of spectral shifts for hydrogen on helium films

Abstract

We show that helium film-mediated hydrogen-hydrogen interactions account for a two orders of magnitude discrepancy between previous theory and recent experiments on cold collision shifts in spin-polarized hydrogen adsorbed on a helium film. These attractive interactions also explain the anomalous dependence of the cold collision frequency shifts on the ${}^3$He covering of the film. Our findings suggest that the gas will become mechanically unstable before reaching the Kosterlitz-Thouless transition unless the experiment is performed in a drastically different regime, for example with a much different helium film geometry.

4+ pages, 1 figure (3 subfigures), revtex4

References in corpus (5)

• Imaging the Mott Insulator Shells using Atomic Clock Shifts
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
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Cited by in corpus (1)

• Hyperfine frequency shift in two-dimensional atomic hydrogen