Theory of momentum-resolved phonon spectroscopy in the electron microscope

Theory of momentum-resolved phonon spectroscopy in the electron microscope

We provide a theoretical framework for the prediction and interpretation of momentum-dependent phonon spectra due to coherent inelastic scattering of electrons. We complete the approach with first-principles lattice dynamics using periodic density functional theory and compare to recent electron ene...

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Detalles Bibliográficos
Main Authors: Nicholls, R, Hage, F, McCulloch, D, Ramasse, Q, Refson, K, Yates, J
Formato: Journal article
Publicado: American Physical Society 2019
Descripción
Summary:We provide a theoretical framework for the prediction and interpretation of momentum-dependent phonon spectra due to coherent inelastic scattering of electrons. We complete the approach with first-principles lattice dynamics using periodic density functional theory and compare to recent electron energy-loss measurements on cubic and hexagonal boron nitride performed within a scanning transmission electron microscope. The combination of theory and experiment provides the ability to interpret momentum-dependent phonon spectra obtained at nanometer spatial resolution in the electron microscope.

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