Imperial College London

DrCeciliaMattevi

Faculty of EngineeringDepartment of Materials

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 0833c.mattevi

 
 
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Location

 

2.11Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bekaert:2017:10.1038/s41598-017-13913-z,
author = {Bekaert, J and Bignardi, L and Aperis, A and van, Abswoude P and Mattevi, C and Gorovikov, S and Petaccia, L and Goldoni, A and Partoens, B and Oppeneer, PM and Peeters, FM and Miloevi, MV and Rudolf, P and Cepek, C},
doi = {10.1038/s41598-017-13913-z},
journal = {Scientific Reports},
title = {Free surfaces recast superconductivity in few-monolayer MgB2: Combined first-principles and ARPES demonstration},
url = {http://dx.doi.org/10.1038/s41598-017-13913-z},
volume = {7},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - 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 MgB2make a major contribution to the superconducting gap spectrum and density of states, clearly distinct from the widely known, bulk-like σ- and π-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 ~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.
AU - Bekaert,J
AU - Bignardi,L
AU - Aperis,A
AU - van,Abswoude P
AU - Mattevi,C
AU - Gorovikov,S
AU - Petaccia,L
AU - Goldoni,A
AU - Partoens,B
AU - Oppeneer,PM
AU - Peeters,FM
AU - Miloevi,MV
AU - Rudolf,P
AU - Cepek,C
DO - 10.1038/s41598-017-13913-z
PY - 2017///
SN - 2045-2322
TI - Free surfaces recast superconductivity in few-monolayer MgB2: Combined first-principles and ARPES demonstration
T2 - Scientific Reports
UR - http://dx.doi.org/10.1038/s41598-017-13913-z
UR - https://www.ncbi.nlm.nih.gov/pubmed/29089566
UR - http://hdl.handle.net/10044/1/58122
VL - 7
ER -