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Permanent link (DOI): https://doi.org/10.7939/R3SQ8QR8P

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POSSIBLE SUPERFLUID PHASE OF PARAHYDROGEN ON NANOPATTERNED SURFACES Open Access

Descriptions

Other title
Subject/Keyword
Superfluidity
Bose Einstein condensation
Supersolid
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Idowu, Saheed A
Supervisor and department
Boninsegni, Massimo (Physics)
Examining committee member and department
Chow, Kim (Physics)
Currie, Claire (Geophysics)
Jung, Jang (Physics)
Department
Department of Physics
Specialization

Date accepted
2015-06-26T14:46:34Z
Graduation date
2015-11
Degree
Master of Science
Degree level
Master's
Abstract
We study by computer simulations the low temperature properties of small parahydrogen clusters (free clusters) and the effect of confinement on the energetics and superfluid properties in two-dimensions (2D). Computed energetics for the free clusters are in quantitative agreement with that reported in the only previous study [M. C. Gordillo and D. M. Ceperley, Phys. Rev. B 65, 174527 (2002)], but a generally strong superfluid response is obtained for clusters with more than ten molecules. All the free clusters, including the smallest one, feature a well-defined, clearly identifiable solidlike structure; with only one possible exception, those with fewer than N = 25 molecules are (almost) entirely superfluid at the lowest temperature considered (i.e., T = 0.25 K), and are thus referred to as nanoscale “supersolids”. The superfluid response in the low temperature limit of the confined clusters is found to remain commensurable in magnitude to that of the free clusters, for clusters fewer than twenty molecules, within a wide range of depth and size of the confining well. The flexibility of the superfluid response is traceable to the “supersolid” character of these clusters. We explore the possibility of establishing a bulk 2D superfluid “cluster crystal” phase of p-H2, in which a global superfluid response would arise from tunnelling of molecules across adjacent unit cells. Computed energetics suggests that for a cluster of about ten molecules, such a phase may be thermodynamically stable against the formation of the equilibrium insulating crystal, for values of cluster crystal lattice constant possibly allowing tunnelling across adjacent unit cells.
Language
English
DOI
doi:10.7939/R3SQ8QR8P
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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