Enhanced superfluid response of parahydrogen in nanoscale confinement

Omiyinka, Tokunbo

doi:10.1103/physrevb.90.064511

Cited by 12 publications

(16 citation statements)

References 31 publications

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“…The results yield evidence that, although confinement can somewhat reduce the strong tendency of the system to crystallize, as observed in spherical cavities (Ref. 16), nevertheless the effect is quantitatively more limited in a cylindrical geometry.…”

Section: Discussionsupporting

confidence: 62%

Quasi-one-dimensional parahydrogen in nanopores

Omiyinka

2016

Phys. Rev. B

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The low temperature physics of parahydrogen (p-H2) confined in cylindrical channels of diameter of the order of 1 nm is studied theoretically by Quantum Monte Carlo simulations. On varying the attractive strength of the wall of the cylindrical pore, as well as its diameter, the equilibrium phase evolves from a single quasi-1D channel along the axis, to a concentric cylindrical shell. It is found that the quasi-1D system retains a strong propensity to crystallization, even though on weakly attractive substrates quantum fluctuations reduce somewhat such a tendency compared to the purely 1D system. No evidence of a topologically protected superfluid phase (in the Luttinger sense) is observed. Implications on the possible existence of a bulk superfluid phase of parahydrogen are discussed.

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Section: Discussionsupporting

confidence: 62%

Quasi-one-dimensional parahydrogen in nanopores

Omiyinka

2016

Phys. Rev. B

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“…So far the only reported enhancement of superfluid response was obtained within PIMC simulations for pH 2 confined inside nano-cavities [19]. The confining medium discussed in this paper is however not realistic, being composed of spherical nano-sized cavities coated with alkali metal thick films in order to reduce the adsorption properties of the cavity walls, which seems hardly feasible at the present time.…”

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confidence: 84%

Superfluid behavior of quasi-one-dimensionalp−H2inside a carbon nanotube

Rossi

Ancilotto

2016

Phys. Rev. B

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“…The liquid-like behavior of hydrogen clusters surrounded by superfluid helium film has been reported for clusters composed of ∼10000 molecules at temperature of ∼1 K [5], and for small clusters of less than 30 molecules, a superfluid response was predicted [6][7][8] and observed at 0.15 K [9]. This observation, however, was somewhat controversial [10,11] resulting in an uncertainty for the behavior of clusters of intermediate size.…”

Section: Introductionmentioning

confidence: 96%

Electron spin resonance study of atomic hydrogen stabilized in solid neon below 1 K

et al. 2018

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We report on an electron spin resonance study of atomic hydrogen stabilized in a solid Ne matrices carried out at a high field of 4.6 T and temperatures below 1 K. The films of Ne, slowly deposited on the substrate at the temperature ∼1 K, exhibited a high degree of porosity. We found that H atoms may be trapped in two different substitutional positions in the Ne lattice as well as inside clusters of pure molecular H2 in the pores of the Ne film. The latter type of atoms was very unstable against recombination at temperatures 0.3-0.6 K. Based on the observed nearly instant decays after rapid small increase of temperature, we evaluate the lower limit of the recombination rate constant kr ≥ 5 · 10 −20 cm 3 s −1 at 0.6 K, five orders of magnitude larger than that previously found in the thin films of pure H2 at the same temperature. Such behavior assumes a very high mobility of atoms and may indicate a solid-to-liquid transition for H2 clusters of certain sizes, similar to that observed in experiments with H2 clusters inside helium droplets (Phys. Rev. Lett 101, 205301 (2008)). We found that the efficiency of dissociation of H2 in neon films is enhanced by 2 orders of magnitude compared to that in pure H2, which is instigated by a strong emission of secondary electrons.

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Enhanced superfluid response of parahydrogen in nanoscale confinement

Cited by 12 publications

References 31 publications

Quasi-one-dimensional parahydrogen in nanopores

Quasi-one-dimensional parahydrogen in nanopores

Superfluid behavior of quasi-one-dimensionalp−H2inside a carbon nanotube

Electron spin resonance study of atomic hydrogen stabilized in solid neon below 1 K

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