Search results for "Davydov splitting"

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Excitons in few-layer hexagonal boron nitride: Davydov splitting and surface localization

2018

Hexagonal boron nitride (hBN) has been attracting great attention because of its strong excitonic effects. Taking into account few-layer systems, we investigate theoretically the effects of the number of layers on quasiparticle energies, absorption spectra, and excitonic states, placing particular focus on the Davydov splitting of the lowest bound excitons. We describe how the inter-layer interaction as well as the variation in electronic screening as a function of layer number $N$ affects the electronic and optical properties. Using both \textit{ab initio} simulations and a tight-binding model for an effective Hamiltonian describing the excitons, we characterize in detail the symmetry of t…

ab-initio many-body perturbation theoryAb initio02 engineering and technology01 natural sciences[SPI.MAT]Engineering Sciences [physics]/MaterialsTight bindingtight-bindingGeneral Materials ScienceOPTICAL ABSORPTIONWave functionmedia_commonPhysicsCondensed Matter - Materials ScienceCondensed matter physics021001 nanoscience & nanotechnologyCondensed Matter PhysicsCondensed Matter::Mesoscopic Systems and Quantum Hall Effect: Physique [G04] [Physique chimie mathématiques & sciences de la terre]Mechanics of MaterialsMATERIAUX 2DTIGHT-BINDINGQuasiparticlesymbols0210 nano-technologyHamiltonian (quantum mechanics)excitonsAbsorption spectroscopyExcitonmedia_common.quotation_subject: Physics [G04] [Physical chemical mathematical & earth Sciences]HEXAGONAL BORON NITRIDEFOS: Physical sciencesEXCITONAsymmetryBNsymbols.namesakeCondensed Matter::Materials ScienceFIRST-PRINCIPLES CALCULATIONS0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)hexagonal boron nitride010306 general physicsCondensed Matter::Quantum GasesCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed Matter::OtherEXCITONSMechanical EngineeringMaterials Science (cond-mat.mtrl-sci)Davydov splittingGeneral Chemistry
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Polymorphic chiral squaraine crystallites in textured thin films

2020

Chirality 32(5), 619 - 631 (2020). doi:10.1002/chir.23213

polarized spectro-microscopyCircular dichroism610mikroskopiaCircular dichroism010402 general chemistry01 natural sciencesCatalysisAnalytical ChemistrypuolijohteetDrug DiscoveryTexture (crystalline)ddc:610Thin filmAnisotropyDicroisme circularDifracció de raigs Xorgaaniset yhdisteetSpectroscopyPharmacologyimaging Mueller matrix polarimetry010405 organic chemistryChemistryOrganic ChemistryDavydov splittingX-rays diffraction0104 chemical sciencesX-ray diffractionCrystallographyX-ray crystallographyOrthorhombic crystal systempolarimetriaCrystalliteohutkalvotröntgenkristallografiaMonoclinic crystal system
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