Abstract/Details

Role of defects in possible superfluidity of spatially ordered helium


2010 2010

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Abstract (summary)

A path integral Monte Carlo investigation of the role of defects in ordered 4He systems has been conducted. We find that interstitial defects in two- and three-dimensional solid 4He can lead to a small but non-zero superfluid fraction, while still maintaining the original solid ordering. Furthermore, a 3He impurity atom initially placed as an interstitial defect is found to relax onto the solid lattice through the promotion of a 4He atom to the interstitial space. We also study the melting transition of pure 4He in two dimensions, where thermally excited defects give rise to unique phases with quasi-long-range order. Finite-size scaling techniques, initially applied to a classical system of Lennard-Jones particles, are found to be able to distinguish two separate melting temperatures. Additionally, coexistence of superfluid and diagonal order was observed in several of our finite-sized samples, raising the possibility that such real- and momentum-space ordering could be held simultaneously by quantum systems in two dimensions.

Indexing (details)


Subject
Quantum physics;
Condensed matter physics;
Theoretical physics
Classification
0599: Quantum physics
0611: Condensed matter physics
0753: Theoretical physics
Identifier / keyword
Pure sciences; Defects; Helium; Spatial order; Superfluidity; Supersolid
Title
Role of defects in possible superfluidity of spatially ordered helium
Author
Wierschem, Keola
Number of pages
112
Publication year
2010
Degree date
2010
School code
0071
Source
DAI-B 72/09, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124711850
Advisor
Manousakis, Efstratios
University/institution
The Florida State University
University location
United States -- Florida
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3462422
ProQuest document ID
879405317
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/879405317
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