Frequency-resolved frozen phonon multislice method and its application to vibrational electron energy loss spectroscopy using parallel illumination
Paul Zeiger, Ján Rusz
Abstract
We explore the capabilities of the frequency-resolved frozen phonon multislice method introduced in [Phys. Rev. Lett. 124, 025501 (2020)] to model inelastic vibrational scattering in transmission electron microscopy. We review the method in detail and discuss advantages of using a so-called hotspot thermostat instead of the $\ensuremath{\delta}$ thermostat used in our first report. We apply the method to simulate vibrational electron energy loss spectra of hexagonal boron nitride under plane wave illumination. Simulated spectroscopic information well represents the theoretical phonon band structure of the studied material, both in terms of energies as well as polarization vectors of individual phonon modes.
Topics & Concepts
PhononSpectroscopyElectron energy loss spectroscopyElectronMaterials scienceScatteringMultisliceMolecular physicsPolarization (electrochemistry)Atomic physicsOpticsPhysicsTransmission electron microscopyCondensed matter physicsChemistryNuclear magnetic resonanceQuantum mechanicsPhysical chemistryAdvanced Electron Microscopy Techniques and ApplicationsElectron and X-Ray Spectroscopy TechniquesSemiconductor materials and devices