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Permanent link (DOI): https://doi.org/10.7939/R3HH6CH07

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SEARCH FOR A SUPERFLUID PHASE OF PARAHYDROGEN: EXPLORING THE EFFECT OF CONFINEMENT Open Access

Descriptions

Other title
Subject/Keyword
PARAHYDROGEN
SUPERFUIDITY
LUTTINGER LIQUID THEORY
WORM ALGORITHM
SILVERA GOLDMAN
PAIR CORRELATION FUNCTION
PAIR POTENTIAL
LUTTINGER PARAMETER
NANOSCALE CONFINEMENT
MODIFIED MORALDI POTENTIAL
MEGABAR PRESSURE
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Omiyinka, Tokunbo P
Supervisor and department
Professor Massimo Boninsegni, Department of Physics (Computational and Theoretical Condensed Matter)
Examining committee member and department
Professor Kim Chow, Department of Physics (Experimental Condensed Matter)
Professor Jan Jung, Department of Physics (Experimental Condensed Matter)
Professor Claire Currie, Department of Physics (Geophysics)
Professor Wolfgang Jaeger, Department of Chemistry
Professor Milton W. Cole (External Reader) , Penn State Department of Physics (Theoretical and Computational Condensed Matter)
Department
Department of Physics
Specialization

Date accepted
2016-06-24T15:14:28Z
Graduation date
2016-06:Fall 2016
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
The first part of this thesis theoretically studies the low temperature physics of parahydrogen (p-H2) confined in cylindrical channels of diameter of the order of 1 nm, based on the Continuous-Space Worm Algorithm 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-one-dimensional (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. Secondly, this research work explores the possibility of existence of a metastable superfluid phase of p-H2 in the low temperature limit. It was found that any possible occurence of superfluidity in supercooled p-H2 would have to be at a much lower temperature than 2 K. Furthermore, this thesis investigates how different p-H2 is from a Bose system that possesses a metastable superfluid phase despite having a crystalline ground state. Finally, study is also carried out to elucidate the inherent distinctions between an hypothetical metastable p-H2 liquid and a metastable 4He liquid, underscoring the essential origin of the almost conclusive absence of superfluidity in any phase of p-H2. Extensive discussions are also provided on the implications of this work for the possible existence of a bulk superfluid phase of parahydrogen.
Language
English
DOI
doi:10.7939/R3HH6CH07
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Tokunbo Omiyinka and Massimo Boninsegni, “Pair potentials and equation of state of solid para-hydrogen to megabar pressure”, Physical Review B 88, 024112 (2013).Tokunbo Omiyinka and Massimo Boninsegni, “Enhanced superfluid response of parahydrogen in nanoscale confinement”, Physical review B 90, 064511 (2014).Tokunbo Omiyinka and Massimo Boninsegni, “Quasi-one-dimensional parahydrogen in nanopores”, Physical review B 93, 104501 (2016).

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