DOCUMENT METADATA
SLAC Publication: SLAC-PUB-16829
SLAC Release Date: March 6, 2017
Directly characterizing the relative strength and momentum dependence of electron-phonon coupling using resonant inelastic x-ray scattering
Devereaux, Thomas.
Thecouplingbetweenlatticeandchargedegreesoffreedomincondensedmattermaterialsisubiquitous
andcanoftenresultininterestingpropertiesandorderedphases,includingconventionalsuperconductivity,
chargedensitywaveorder,andmetal-insulatortransitions.Angle-resolvedphotoemissionspectroscopyand
bothneutronandnon-resonantx-rayscatteringserveaseffectiveprobesfordeterminingthebehaviorofap-
propriate,individualdegreesoffreedomtheelectronicstructureandlatticeexcitation,orphonondispersion,
respectively.However,each... Show Full Abstract
Thecouplingbetweenlatticeandchargedegreesoffreedomincondensedmattermaterialsisubiquitous
andcanoftenresultininterestingpropertiesandorderedphases,includingconventionalsuperconductivity,
chargedensitywaveorder,andmetal-insulatortransitions.Angle-resolvedphotoemissionspectroscopyand
bothneutronandnon-resonantx-rayscatteringserveaseffectiveprobesfordeterminingthebehaviorofap-
propriate,individualdegreesoffreedomtheelectronicstructureandlatticeexcitation,orphonondispersion,
respectively.However,eachprovideslessdirectinformationaboutthemutualcouplingbetweenthedegreesof
freedom,usualthroughself-energyeffects,whichtendtorenormalizeandbroadenspectralfeaturesprecisely
wherethecouplingisstrong,impactingonesabilitytoquantitivelycharacterizethecoupling.Herewedemon-
stratethatresonantinelasticx-rayscattering,orRIXS,canbeaneffectivetooltodirectlydeterminetherelative
strengthandmomentumdependenceoftheelectron-phononcouplingincondensedmattersystems.Usinga
diagrammaticapproachforan8-bandmodelofcopperoxides,westudythecontributionsfromthelowestorder
diagramstothefullRIXSintensityforarealisticscatteringgeometry,accountingformatrixelementeffects
inthescatteringcross-sectionaswellasthemomentumdependenceoftheelectron-phononcouplingvertex.
Adetailedexaminationofthesemapsoffersauniqueperspectiveintothecharacteristicsofelectron-phonon
coupling,whichcomplementsbothneutronandnon-resonantx-rayscattering,aswellasRamanandinfrared
conductivity. Show Partial Abstract
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