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We have carried out variational calculations of the properties of a quantum vortex line
He using a shadow wave-function, which generates a distributed vorticity. Based on these calculations we present a microscopic of study the binding of a single
He to the vortex using both the...
The temperature dependence of the dynamic structure factor S(Q,ω) for superfluid
He has been measured by inelastic neutron scattering for wave vectors between 2.3 and 2.6 Å
−l. S(Q,ω) has two peaks: one sharp peak at low energies whose dispersion flattens out and whose strength decreases with...
Surface tension of liquid
He was measured using the capillary rise method. A 8 T magnetic field was applied to study the magnetic response. We found that the temperature dependence of the surface tension in 8 T magnetic field was almost the same as that found in zero field by Suzuki et al...
He spin diffusion results for
He - 4
He mixture films on Nuclepore are presented as a function of
He coverage for 0.1 ≤ T ≤ 0.3 K. We report measurements for a constant
He coverage of 4.41 bulk density atomic layers with
He coverages between 0.3 and 2.1 layers. The...
In order to study the combined nature of 2D and 3D superfluidity and the vortex state in thin
He films formed in porous glasses superflow properties are studied using effective thermal conductance measurements. Detailed study, though still preliminary, reveals quite different features from 2D...
We report new specific heat data for
He confined between two silicon wafers at 0.0483 μm separation. This extends our work by a factor of two in the range of confinements studied, and allows us a better check on scaling predictions. The present data have been obtained with a new design for the...
With an optical dipole trap it is possible to confine Bose–Einstein condensates in different hyperfine states and in arbitrary magnetic bias fields, thus overcoming two major limitations of magnetic traps. In this review paper we characterize the properties of such a dipole trap and we summarize...
Macroscopic dynamics of the hydrodynamic (Lamb) impulse
induced by the chaotic vortex filaments in the counterflowing superfluid turbulent HeII is studied. Both the Lamb impulse and its dynamics are considered on the basis of the Gaussian model of chaotic vortex tangle elaborated earlier by...
We have measured heat capacities of monolayer
He floated on a superfluid
He thin film (three atomic layers) adsorbed on graphite at low temperatures. The
He films behave as degenerate 2D Fermi fluids with m* ≈ 1.3m
3, where m* is the quasiparticle effective mass and m
is the bare mass...
The momentum transferred to large superfluid
$$(\overline N \approx 1.5 \cdot 10^9 )$$
in low energy (≈ 4–10 K) scattering from
He atoms was determined from time of flight measurements after the droplets have passed through a low temperature (T = 1.7–4.2 K)...
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