Objective Using direct ESR detection of atomic hydrogen adsorbed on the surface of liquid helium the contractors will elucidate mechanisms responsible for the shape and position of the ESR lines. They will also study diffusion, magnetic relaxation and recombination in the 2D gas, determine how these processes and the ESR signal are influenced by the appearance of a quasi-condensate (QC) and 2D superfluidity and detect, for the first time, the 2D superfluidity in a quantum gas. As a primary stage of experiments on a degenerate 2D Bose gas with a tunable interaction, it is planned to study the effect of 2D 3He on the behaviour of 2D H, especially what concerns the QC and superfluidity, through the related changes in the ESR signal and the decay kinetics of the sample.The project is also aimed to investigate experimentally the 2D Fermi gases formed by the surface states of 3He atoms on bulk 3He-4He mixtures and their macroscopically thick films. These experiments comprise measurements of surface sound in 2D 3He gas when both surface states are occupied as well as measurements of the sound velocity and attenuation by resonance techniques. It is intended to clarify whether the surface sound in 3He may be applied to hydrogen studies via the influence of 2D H on the sound propagation, especially in case of superfluidity and/or QC in hydrogen. This may yield an independent approach to the detection of 2D superfluidity.The 2D hydrogen adsorbed on helium surface is thermally compressed to quantum degeneracy on a small "cold spot" refrigerated to a much lower temperature than other surfaces of the cell. The spot is located in the focus of a Fabry-Perot resonator of a heterodyne 128 GHz ESR spectrometer to detect both bulk and 2D fractions of the hydrogen sample. The total recombination rate in the sample cell is measured as the feedback power of a temperature controller. To achieve 2D densities of hydrogen adequate for quasi-condensation and superfluidity transition a combination of thermal and magnetic compression will be implemented.The surface sound in 2D 3He is studied in the resonator with well-separated intrinsic modes. The sound is excited and detected thermally, with the transmitter and receiver made of mm-sized thick-film resistors located on opposite sides in the centre of the resonator. Programme(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Topic(s) 1B - Condensed Matter, Optics and Plasma Physics OPEN - OPEN Call Call for proposal Data not available Funding Scheme Data not available Coordinator Wihuri Physical Laboratory EU contribution No data Address Vesilinnantie 5 20014 Turku Finland See on map Total cost No data Participants (3) Sort alphabetically Sort by EU Contribution Expand all Collapse all Institute for Theoretical Physics Netherlands EU contribution No data Address Leuvenlaan 4 3584 CE Utrecht See on map Total cost No data Russian Academy of Sciences Russia EU contribution No data Address 2 Kosygin str. 117334 Moscow See on map Total cost No data Russian Research Center "Kurchatov Institute" Russia EU contribution No data Address Kurchatov square 1 123182 Moscow See on map Total cost No data
