Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Czechoslovak Journal of Physics

Atomic hydrogen experiments at the onset of two-dimensional superfluidity

A. I. Safonov, Sergey A. Vasilyev, Igor Stanislavovich Yasnikov, E. Tjukanov, I. I. Lukashevich, S. Jaakkola

Published Jan 1, 1996• 4 citations
Publisher
DOI
10.1007/bf02569685

Related papers

Fluctuation correlation and superfluidity in a two-dimensional film of atomic hydrogen

S. I. Shevchenko

The possibility of superfluidity in a film of spin-polarized atomic hydrogen adsorbed at the surface of the hydrogen-containing vessel is studied. It is shown that the transition to the superfluid phase occurs as a topological phase transition. A criterion for the transition of the hydrogen film into the superfluid (but not crystalline) phase is established. It is shown that the superfluid transition can occur only when the interaction constant γ, related to the interaction potential of hydrogen atoms by the relation V(ρ1 − ρ2) = γδ(p1 − p2), satisfies the inequality γ ≲ πħ2/m, where m is the mass of a hydrogen atom. The transition temperature is found.

Soviet Journal of Low Temperature Physics•May 1, 1982•0 citations

The possible superfluid behaviour of hydrogen atom gases and liquids

Charles E. Hecht

Physica•Jan 1, 1959•62 citations

Recent experiments on superfluidity

Kurt Alfred Georg Mendelssohn

Il Nuovo Cimento•Mar 1, 1958•5 citations

Thermal compression of two-dimensional atomic hydrogen gas

Sergey A. Vasilyev, Jarno Järvinen, A. I. Safonov +1 more

We describe experiments where two-dimensional (2D) atomic hydrogen gas is compressed thermally at a small ``cold spot'' on the surface of superfluid helium and detected directly with electron-spin resonance. We reach surface densities up to $5\ifmmode\times\else\texttimes\fi{}{10}^{12}{\mathrm{cm}}^{\ensuremath{-}2}$ at temperatures $\ensuremath{\approx}100\mathrm{mK}$ corresponding to the maximum 2D phase-space density $\ensuremath{\approx}1.5.$ By independent measurements of the surface density and its decay rate we make a direct determination of the three-body recombination rate constant and get the upper bound ${L}_{3b}\ensuremath{\lesssim}2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}25}{\mathrm{cm}}^{4}/\mathrm{s}$ which is an order of magnitude smaller than previously reported experimental results.

arXiv:cond-mat/0303496•Physical Review A•Feb 18, 2004•14 citations

Kosterlitz-Thouless Transition of the Quasi-Two-Dimensional Trapped Bose Gas

Markus Holzmann, Werner Krauth

We use quantum Monte Carlo methods to compute the density profile, the nonclassical moment of inertia, and the condensate fraction of an interacting quasi-two-dimensional trapped Bose gas with up to N ~ 5 x 10(5) atoms and parameters closely related to recent experiments. We locate the Kosterlitz-Thouless temperature T(KT) and discuss intrinsic signatures of the onset of superfluidity in the density profile. Below T(KT), the condensate fraction is macroscopic even for our largest systems and decays only slowly with system size. We show that the thermal population of excited states in the transverse direction changes the two-dimensional density profile noticeably in both the normal and the superfluid phase.

arXiv:0710.5060•Physical Review Letters•May 12, 2008•87 citations

Superfluidity: an overview

K.H. Bennemann, John B. Ketterson

•Jan 1, 2014•0 citations
The possibility of superfluidity in a film of spin-polarized atomic hydrogen adsorbed at the surface of the hydrogen-containing vessel is studied. It is shown that the transition to the superfluid phase occurs as a topological phase transition. A criterion for the transition of the hydrogen film into the superfluid (but not crystalline) phase is established. It is shown that the superfluid transition can occur only when the interaction constant γ, related to the interaction potential of hydrogen atoms by the relation V(ρ1 − ρ2) = γδ(p1 − p2), satisfies the inequality γ ≲ πħ2/m, where m is the mass of a hydrogen atom. The transition temperature is found.
We describe experiments where two-dimensional (2D) atomic hydrogen gas is compressed thermally at a small ``cold spot'' on the surface of superfluid helium and detected directly with electron-spin resonance. We reach surface densities up to $5\ifmmode\times\else\texttimes\fi{}{10}^{12}{\mathrm{cm}}^{\ensuremath{-}2}$ at temperatures $\ensuremath{\approx}100\mathrm{mK}$ corresponding to the maximum 2D phase-space density $\ensuremath{\approx}1.5.$ By independent measurements of the surface density and its decay rate we make a direct determination of the three-body recombination rate constant and get the upper bound ${L}_{3b}\ensuremath{\lesssim}2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}25}{\mathrm{cm}}^{4}/\mathrm{s}$ which is an order of magnitude smaller than previously reported experimental results.
We use quantum Monte Carlo methods to compute the density profile, the nonclassical moment of inertia, and the condensate fraction of an interacting quasi-two-dimensional trapped Bose gas with up to N ~ 5 x 10(5) atoms and parameters closely related to recent experiments. We locate the Kosterlitz-Thouless temperature T(KT) and discuss intrinsic signatures of the onset of superfluidity in the density profile. Below T(KT), the condensate fraction is macroscopic even for our largest systems and decays only slowly with system size. We show that the thermal population of excited states in the transverse direction changes the two-dimensional density profile noticeably in both the normal and the superfluid phase.