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Title
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Free surfaces recast superconductivity in few-monolayer : combined first-principles and ARPES demonstration
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Author
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Abstract
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| Two-dimensional materials are known to harbour properties very different from those of their bulk counterparts. Recent years have seen the rise of atomically thin superconductors, with a caveat that superconductivity is strongly depleted unless enhanced by specific substrates, intercalants or adatoms. Surprisingly, the role in superconductivity of electronic states originating from simple free surfaces of two-dimensional materials has remained elusive to date. Here, based on first-principles calculations, anisotropic Eliashberg theory, and angle-resolved photoemission spectroscopy (ARPES), we show that surface states in few-monolayer MgB2 make a major contribution to the superconducting gap spectrum and density of states, clearly distinct from the widely known, bulk-like sigma-and pi-gaps. As a proof of principle, we predict and measure the gap opening on the magnesium-based surface band up to a critical temperature as high as similar to 30 K for merely six monolayers thick MgB2. These findings establish free surfaces as an unavoidable ingredient in understanding and further tailoring of superconductivity in atomically thin materials. |
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Language
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English
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Source (journal)
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Scientific reports. - London, 2011, currens
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Publication
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London
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Nature Publishing Group
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2017
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ISSN
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2045-2322
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DOI
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10.1038/S41598-017-13913-Z
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Volume/pages
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7
(2017)
, 12 p.
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Article Reference
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14458
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ISI
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000414231000059
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Pubmed ID
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29089566
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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