6533b85dfe1ef96bd12be97d
RESEARCH PRODUCT
Splitting of the surface phonon modes in wurtzite nanowires
Ana CrosF. DemangeotF. DemangeotBruno DaudinJiangfeng WangRenaud PéchouRenaud Péchousubject
Materials sciencePhononNanowireGeneral Physics and AstronomyContext (language use)02 engineering and technology01 natural sciencesZinc sulfidesymbols.namesakeCondensed Matter::Materials ScienceOptics0103 physical sciencesDipolar interactionEffective medium theoriesWurtzite nanowiresAluminum nitrideWurtzite crystal structure010302 applied physics[PHYS]Physics [physics]Condensed matter physicsbusiness.industryFilling factorNanowiresGeneral EngineeringMaterial systemsSurface phonon021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall EffectMaxwell-GarnettComparative studiesSurfacesDipolesymbolsPhononsWurtzite structure0210 nano-technologybusinessRaman spectroscopySurface phonon modedescription
We analyze the surface optical modes of GaN nanowires (NW) and perform a comparative study with the characteristics expected for other polar NWs. The theoretical analysis of the modes is performed within the context of the effective medium theory that takes into account the dipolar interaction between neighboring NWs (Maxwell-Garnett approximation). It is shown that deviations of the exciting light from the NWs axis, which coincides with the wurtzite c-axis, result in the anticrossing of two distinct surface phonon branches, leading to their splitting in axial and planar components and the appearance of two peaks in the Raman spectra. Additional calculations are performed that determine the relevant filling factor at which this anticrossing takes place for NWs based on AlN, InN, ZnO, as well as other material systems that may crystallize in the wurtzite structure when grown in the form of NWs, such as GaP and InAs. We analyze the splitting of the surface modes as a function of the material's ionicity.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-05-20 |