RIPPLON-INDUCED TUNNELING TRANSVERSE TO THE MAGNETIC-FIELD

We analyze single-electron tunneling from the bound state above the su rface of liquid helium. For strong enough magnetic fields parallel to the surface, the tunneling must be accompanied by ripplon scattering. The effective width of the tunneling barrier strongly and nonmonotonic ally depends on the momentum transferred to ripplons. The escape rate is affected by Landau quantization of the states behind the barrier. T he results obtained here also apply to electrons on other cryogenic su bstrates. [S0163-1829(98)50444-4].