Lattice dynamics of epitaxial strain-free interfaces | |
Article | |
关键词: NUCLEAR RESONANT SCATTERING; DENSITY-OF-STATES; SUPER-LATTICE; PHONON; SUPERLATTICES; MAGNETORESISTANCE; CONDUCTION; FE3SI; GAAS; | |
DOI : 10.1103/PhysRevB.98.121409 | |
来源: SCIE |
【 摘 要 】
We report a systematic lattice dynamics study of the technologically important Fe3Si/GaAs heterostructure for Fe3Si layer thicknesses of 3, 6, 8, and 36 monolayers. The Fe-partial phonon density of states obtained by nuclear inelastic scattering exhibits up to a twofold enhancement of the low-energy phonon states compared to the bulk material for layer thicknesses of 8 monolayers and below. First-principles calculations explain the observed effect by interface-specific phonon states originating from the significantly reduced atomic force constants and allow for achieving a comprehensive understanding of the lattice dynamics of epitaxial strain-free interfaces.
【 授权许可】
Free