Experimental Evidence for a New State in 2D Bose Gas: Quasi-Condensation in Atomic Hydrogen

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We have obtained two-dimensional (2D) Bose gas with the degeneracy parameter (phase-space density) up to 9 compressing magnetically atomic hydrogen adsorbed on liquid 4He at about 0.2 K. We observed this 2D gas to go over to a state where the rate constant Kbbb of three-body recombination of hydrogen atoms decreases with respect to its normal value. A steep decline in Kbbb begins when the degeneracy parameter exceeds 3, i.e., before the criterion for 2D superfluidity is satisfied. The maximum observed suppresion of Kbbb is essentially larger than 3! predicted for a three-body process in a fully (quasi)condensed sample.

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