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dc.contributor.authorPatane, Amalia
dc.date.accessioned2017-01-03T16:01:14Z
dc.date.available2017-01-03T16:01:14Z
dc.date.issued2017-01-03
dc.identifier.urihttps://rdmc.nottingham.ac.uk/handle/internal/72
dc.description.abstractThe electronic band structure of van der Waals (vdW) layered crystals has properties that depend on the composition, thickness and stacking of the component layers. Here we use density functional theory and high field magneto-optics to investigate the metal chalcogenide InSe, a recent addition to the family of vdW layered crystals, which transforms from a direct to an indirect band gap semiconductor as the number of layers is reduced. We investigate this direct-to-indirect bandgap crossover, demonstrate a highly tuneable optical response from the near infrared to the visible spectrum with decreasing layer thickness down to 2 layers, and report quantum dot-like optical emissions distributed over a wide range of energy. Our analysis also indicates that electron and exciton effective masses are weakly dependent on the layer thickness and are significantly smaller than in other vdW crystals. These properties are unprecedented within the large family of vdW crystals and demonstrates the potential of InSe for electronic and photonic technologies.en_UK
dc.language.isoenen_UK
dc.publisherThe University of Nottinghamen_UK
dc.relation.urihttp://www.nature.com/articles/srep39619en_UK
dc.subject.lcshIndium compoundsen_UK
dc.subject.lcshSemiconductors -- Optical propertiesen_UK
dc.subject.lcshEnergy-band theory of solidsen_UK
dc.subject.lcshLayer structure (Solids)en_UK
dc.subject.lcshMagnetoopticsen_UK
dc.titleThe direct-to-indirect band gap crossover in two-dimensional van der Waals indium selenide crystalsen_UK
dc.identifier.doihttp://doi.org/10.17639/nott.69
dc.subject.jacsPhysical sciences::Physics::Optical physics, Laser physicsen_UK
dc.subject.lcQ Science::QC Physics::QC170 Atomic physics. Constitution and properties of matteren_UK
dc.subject.lcQ Science::QC Physics::QC350 Optics. Light, including spectroscopyen_UK
dc.subject.lcQ Science::QC Physics::QC501 Electricity and magnetismen_UK
dc.date.collection2014-2016en_UK
uon.divisionUniversity of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomyen_UK
uon.funder.controlledEngineering & Physical Sciences Research Councilen_UK
uon.funder.controlledOtheren_UK
uon.datatypeASCII Data experiment and theoryen_UK
uon.funder.freeThe Royal Societyen_UK
uon.funder.freeEU Graphene Flagshipen_UK
dc.relation.doi10.1038/srep39619en_UK


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