1 - 10 of 18 articles
We present proof-of-concept measurements of the vortex line density generated by a quartz tuning fork resonator probed by the attenuation of second sound in superfluid
He at 1.6 K. The force–velocity response of a quartz tuning fork operating at a frequency of 31 kHz exhibited...
The heat capacities of a small amount of
He dissolved in monolayer
He films are measured to clarify natures of monolayer
He films. With increasing areal density, the measured heat capacities gradually increase and subsequently gradually...
We investigate strong-coupling properties of a two-dimensional ultracold Fermi gas in the normal state. Including pairing fluctuations within the framework of a T-matrix approximation, we calculate the distribution function
of Cooper pairs in terms of the...
Dimensional crossover to the one-dimensional (1D) state from higher dimensions has been studied for dilute
He fluid adsorbed in 2.4 nm
He-preplated nanochannels, by susceptibility measurements down to 70 mK using 4.29 MHz nuclear magnetic resonance. In...
We report on the measurements of electrons trapped in solid molecular films of H
, HD, and D
. A narrow ESR line associated with the trapped electrons was detected with
, which turned out to be shifted by
A 1D Bose fluid has been actually realized for the
He nanotubes formed in 1D nanochannels, and the superfluidity observed by a torsional oscillator. Dependence of the superfluid density on the channel diameter was qualitatively well explained by a theory that the superfluid...
Perturbation theory of superfluid fraction in terms of nonuniform potential is constructed. We find that the coefficient of the leading term is determined by the dynamical structure factor or density fluctuation of the system. The results for the ideal Bose gas and the interacting Bose system...
We theoretically investigate magnetic properties of a unitary Fermi gas in a harmonic trap. Including strong pairing fluctuations within the framework of an extended T-matrix approximation, as well as effects of a trap potential within the local density approximation, we calculate the local spin...
The shear modulus of hcp
He decreases significantly above
200 mK, as
He impurities unbind from dislocations, unpinning them, and softening the crystal. Here we report shear modulus measurements on a fermi quantum solid: bcc
We report computer simulations of the interaction of seeding particles with quantized vortices and with the normal fluid flow in thermal counterflow of superfluid
He. We show that if the number of particles is too large, the vortex tangle is significantly affected, posing...
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