Abstract
We discuss the nature of the elementary excitations for a gas of spin-polarized atomic hydrogen adsorbed on the free surface of liquid helium. Below the Kosterlitz-Thouless transition temperature the coupling between above-condensate hydrogen atoms and ripplons through the hydrogen quasicondensate results in the elementary excitations being superpositions of hydrogen quasiparticles (single atom at large momenta and phonon at small momenta) and ripplons. For realistic values of the condensate density this hybridization is appreciable.
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