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】

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