Please use this identifier to cite or link to this item: https://doi.org/10.1088/1742-6596/864/1/012033
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dc.titleExciton spectrum in two-dimensional transition metal dichalcogenides: The role of Diracness
dc.contributor.authorTrushin, M
dc.contributor.authorGoerbig, M.O
dc.contributor.authorBelzig, W
dc.date.accessioned2020-10-23T04:41:02Z
dc.date.available2020-10-23T04:41:02Z
dc.date.issued2017
dc.identifier.citationTrushin, M, Goerbig, M.O, Belzig, W (2017). Exciton spectrum in two-dimensional transition metal dichalcogenides: The role of Diracness. Journal of Physics: Conference Series 864 (1) : 12033. ScholarBank@NUS Repository. https://doi.org/10.1088/1742-6596/864/1/012033
dc.identifier.issn17426588
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/179464
dc.description.abstractThe physics of excitons, electron-hole pairs that are bound together by their mutual Coulomb attraction, can to great extent be understood in the framework of the quantum-mechanical hydrogen model. This model has recently been challenged by spectroscopic measurements on two-dimensional transition-metal dichalchogenides that unveil strong deviations from a hydrogenic spectrum. Here, we show that this deviation is due to the particular relativistic character of electrons in this class of materials. Indeed, their electrons are no longer described in terms of a Schr�dinger but a massive Dirac equation that intimately links electrons to holes. Dirac excitons therefore inherit a relativistic quantum spin-1/2 that contributes to the angular momentum and thus the exciton spectrum. Most saliently, the level spacing is strongly reduced as compared to the hydrogen model, in agreement with spectroscopic measurements and ab-initio calculations.
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceUnpaywall 20201031
dc.subjectCalculations
dc.subjectElectrons
dc.subjectLinear equations
dc.subjectQuantum theory
dc.subjectRelativity
dc.subjectTransition metals
dc.subjectAb initio calculations
dc.subjectCoulomb attraction
dc.subjectDirac equations
dc.subjectElectron hole pairs
dc.subjectExciton spectra
dc.subjectQuantum mechanical
dc.subjectSpectroscopic measurements
dc.subjectTransition metal dichalcogenides
dc.subjectExcitons
dc.typeConference Paper
dc.contributor.departmentCENTRE FOR ADVANCED 2D MATERIALS
dc.description.doi10.1088/1742-6596/864/1/012033
dc.description.sourcetitleJournal of Physics: Conference Series
dc.description.volume864
dc.description.issue1
dc.description.page12033
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