Neutrons on a surface of liquid helium

Neutron reflection from the liquid helium surface

Surface State Electron Dynamics on Deformed Liquid Helium Films

Electrons can form stable two-dimensional systems above the surface of dielectric substances like superžuid liquid helium (LHe). Due to the extreme purity and smoothness of the LHe surface, electrons on bulk LHe proved to be a versatile (with respect to the facility for changing physical parameters like temperature and magnetic eld, but especially electron density) and clean (with respect to e...

Charges near the free surface of liquid helium: collective effects

Two types of two-dimensional (2D) charged systems can appear near the free surface of liquid helium: surface electrons and surface ions [1]. The existence of these two systems has been predicted almost simultaneously (see Ref. [2] ). However, the electron variant of the problem has subsequently been investigated more thoroughly both theoretically and experimentally. The interest in 2D ion syste...

Strong Coupling of the Cyclotron Motion of Surface Electrons on Liquid Helium to a Microwave Cavity.

The strong coupling regime is observed in a system of two-dimensional electrons whose cyclotron motion is coupled to an electromagnetic mode in a Fabry-Perot cavity resonator. Rabi splitting of eigenfrequencies of the coupled motion is observed both in the cavity reflection spectrum and ac current of the electrons, the latter probed by measuring their bolometric photoresponse. Despite the fact ...

Stationary soliton on a charged surface of liquid helium and hydrogen films

A change in the shape of a charged surface of liquid hydrogen and helium — the formation of a solitary wave ~a positively charged hump for hydrogen and a negatively charged dimple for helium! – is observed in an electric field exceeding a critical value under conditions of total compensation of the applied field by the surface charge. © 1997 American Institute of Physics. @S0021-3640~97!01107-9#