| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Watanabe, K.
Engineering and Physical Sciences Research Council
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (26/26 displayed)
- 2024Resonant band hybridization in alloyed transition metal dichalcogenide heterobilayerscitations
- 2023Twist angle dependent interlayer transfer of valley polarization from excitons to free charge carriers in WSe2/MoSe2 heterobilayerscitations
- 2023Magnetism-Induced Band-Edge Shift as the Mechanism for Magnetoconductance in CrPS4 Transistorscitations
- 2022Guided Wave Transceive Technique Using Magnetostrictive Effect of STPG370 Pipe itself and High-Temperature Superconductor SQUIDcitations
- 2021Tuneable spin injection in high-quality graphene with one-dimensional contacts
- 2021Cathodoluminescence of carbon-related defects in hexagonal boron nitride
- 2020Low-temperature monoclinic layer stacking in atomically thin CrI3 crystalscitations
- 2020Untying the insulating and superconducting orders in magic-angle graphenecitations
- 2019Nonreversible Transition from the Hexagonal to Wurtzite Phase of Boron Nitride under High Pressure: Optical Properties of the Wurtzite Phasecitations
- 2019Sensitivity of the superconducting state in thin filmscitations
- 20192D-3D integration of high-kappa dielectric with 2D heterostructures for opto-electronic applicationscitations
- 2018Unusual Suppression of the Superconducting Energy Gap and Critical Temperature in Atomically Thin NbSe2citations
- 2018Time-of-Flight Neutron Imaging on IMAT@ISIS: A New User Facility for Materials Science
- 2017Edge currents shunt the insulating bulk in gapped graphenecitations
- 2017Edge currents shunt the insulating bulk in gapped graphenecitations
- 2017Edge currents shunt the insulating bulk in gapped graphenecitations
- 2017Ballistic superconductivity in semiconductor nanowires:
- 2017Superplasticity of Inconel 718 after processing by high-pressure sliding (HPS)citations
- 2013Grain boundary segregation in a bronze-route Nb3Sn superconducting wire studied by atom probe tomographycitations
- 2012Grain structure and irreversibility line of a bronze route CuNb reinforced Nb3Sn multifilamentary wirecitations
- 2011(Lu0.8Ce0.2)2Fe17 single crystal under hydrostatic and 'negative' pressure induced by hydrogenationcitations
- 2011Magnetic states and magnetostriction in Y.sub.2./sub.Fe.sub.17-x./sub.Ru.sub.x./sub. system
- 2011(Lu.sub.0.8./sub.Ce.sub.0.2./sub.).sub.2./sub.Fe.sub.17./sub. single crystal under hydrostatic and ‘negative’ pressure induced by hydrogenationcitations
- 2011High-field magnetization study of R.sub.2./sub.Fe.sub.17./sub.H.sub.3./sub. (R=Tb,Dy,Ho and Er) single-crystalline hydridescitations
- 2010Sublattice contributions to the magnetism of UFe.sub.5./sub.Al.sub.7./sub. and UFe.sub.6./sub.Al.sub.6./sub.citations
- 2010Crystal structure and magnetoelastic properties of Lu.sub.2./sub.Fe.sub.16.5./sub.Ru.sub.0.5./sub. intermetallic compound
Places of action
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article
Unusual Suppression of the Superconducting Energy Gap and Critical Temperature in Atomically Thin NbSe2
Abstract
It is well-known that superconductivity in thin films is generally suppressed with decreasing thickness. This suppression is normally governed by either disorder-induced localization of Cooper pairs, weakening of Coulomb screening, or generation and unbinding of vortex–antivortex pairs as described by the Berezinskii–Kosterlitz–Thouless (BKT) theory. Defying general expectations, few-layer NbSe2, an archetypal example of ultrathin superconductors, has been found to remain superconducting down to monolayer thickness. Here, we report measurements of both the superconducting energy gap Δ and critical temperature TC in high-quality monocrystals of few-layer NbSe2, using planar-junction tunneling spectroscopy and lateral transport. We observe a fully developed gap that rapidly reduces for devices with the number of layers N ≤ 5, as does their TC. We show that the observed reduction cannot be explained by disorder, and the BKT mechanism is also excluded by measuring its transition temperature that for all N remains very close to TC. We attribute the observed behavior to changes in the electronic band structure predicted for mono- and bi- layer NbSe2 combined with inevitable suppression of the Cooper pair density at the superconductor-vacuum interface. Our experimental results for N > 2 are in good agreement with the dependences of Δ and TC expected in the latter case while the effect of band-structure reconstruction is evidenced by a stronger suppression of Δ and the disappearance of its anisotropy for N = 2. The spatial scale involved in the surface suppression of the density of states is only a few angstroms but cannot be ignored for atomically thin superconductors.