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Influence of Nanosize Hole Defects and their Geometric Arrangements on the Superfluid Density in Atomically Thin Single Crystals of Indium Superconductor

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Abstract
Using Indium root 7 x root 5 on Si(111) as an atomically thin superconductor platform, and by systematically controlling the density of nanohole defects (nanometer size voids), we reveal the impacts of defect density and defect geometric arrangements on superconductivity at macroscopic and microscopic length scales. When nanohole defects are uniformly dispersed in the atomic layer, the superfluid density monotonically decreases as a function of defect density (from 0.7% to 5% of the surface area) with minor change in the transition temperature T-C, measured both microscopically and macroscopically. With a slight increase in the defect density from 5% to 6%, these point defects are organized into defect chains that enclose individual two-dimensional patches. This new geometric arrangement of defects dramatically impacts the superconductivity, leading to the total disappearance of macroscopic superfluid density and the collapse of the microscopic superconducting gap. This study sheds new light on the understanding of how local defects and their geometric arrangements impact superconductivity in the two-dimensional limit.
Author(s)
Mengke LiuHyoungdo Nam김정대Gregory A FieteChih-kang Shih
Issued Date
2021
Type
Article
Keyword
Crystal structureImpurities in superconductorsSuperconducting gapSuperconducting order parameterSuperconducting phase transition2-dimensional systemsLow-temperature superconductorsThin filmsScanning tunneling spectrocopySusceptibility measurements
DOI
10.1103/PhysRevLett.127.127003
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9527
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_proquest_miscellaneous_2578771127&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Influence%20of%20Nanosize%20Hole%20Defects%20and%20their%20Geometric%20Arrangements%20on%20the%20Superfluid%20Density%20in%20Atomically%20Thin%20Single%20Crystals%20of%20Indium%20Superconductor&sortby=rank&pcAvailability=true
Publisher
PHYSICAL REVIEW LETTERS
Location
미국
Language
영어
ISSN
0031-9007
Citation Volume
127
Citation Number
12
Citation Start Page
127003
Citation End Page
127003
Appears in Collections:
Natural Science > Physics
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