6533b82afe1ef96bd128c01e
RESEARCH PRODUCT
Raman studies of isotope effects in Si and GaAs
Andrés CantareroI. SilierW. KriegseisA. GöbelErich SchönherrV.i. OzhoginJ. CamachoT. RufF. WidulleManuel Cardonasubject
Materials sciencePhononAnharmonicityReduced massCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsAtomic massElectronic Optical and Magnetic Materialssymbols.namesakeKinetic isotope effectsymbolsElectrical and Electronic EngineeringAtomic physicsRaman spectroscopyRaman scatteringLine (formation)description
Abstract We have measured by Raman scattering changes of the optic phonon energy and line width in Si and GaAs with isotopic composition. The phonon energies of isotopically pure samples show the expected dependence on the average atomic mass in Si and the reduced mass in GaAs, respectively, as well as small anharmonic contributions. In isotopically disordered samples we find frequency shifts of 1.15(20) cm−1 for 28Si0.530Si0.5 and 0.31(20) cm−1 for the TO phonon of natGaAs, induced by mass disorder which also contributes to the line broadening. We give theoretical estimates of these effects.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-03-01 | Physica B: Condensed Matter |