Global ETD Search
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Showing 1 to 8 of 8 for “"surface phonons"”.
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Phonon Behaviour at Advanced Material Interfaces using Electron Energy Loss Spectroscopy
… (STEM) enable the study of lattice vibrations (phonons) with nanoscale spatial resolution using electron energy loss spectroscopy (EELS). Probing phonons at this spatial resolution provides access to vibrational properties associated with structural features in which the crystal symmetry is …
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Temperature dependent structural, electronic and optical properties of the Si(100) surface from first principles
… simulations for the Si bulk and Si(100) surface; ab-initio molecular dynamics (AIMD) using the Car-Parrinello Molecular Dynamics formalism (CPMD) and Born-Oppenheimer Molecular Dynamics (BOMD), related vibrational states (surface phonons) by calculating the vibrational density of states …
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Quantum dynamical study of Si(100) surface-mounted, STM-driven switches at the atomic and molecular scale
… microscope (STM)-controllable, Si(100)(2x1) surface-mounted switches of atomic and molecular scale. The first example considers the switching of single H-atoms between two dangling-bond chemisorption sites on a Si-dimer of the Si(100) surface (Grey et al., 1996). The second system examines …
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Scattering in Nano-Electronic Devices
… to predict inversion channel mobility. Impact of surface phonons (originating from high-a- dielectric) on mobility degradation is evaluated using the model, incorporating newly proposed criteria for determining Landau damping regimes. Phonon-electron interaction- the most dominant scattering …
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Surface phonon polaritons coupled to the far-field by a grating at high temperature
This thesis explores surface phonon polaritons (SPhP) in quartz coupled to the far field by gratings, and the temperature dependence of SPhP coupled to the far field. The subject of coupling SPhP to the far-field has been studied in the past, but not at high temperature. Devices proposed to control …
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Polarization-induced transport in ferroelelctric organic field-effect transistors
… from a coupling of the charge carriers to the surface phonons of the dielectric layer. A negative coefficient of carrier mobility is observed in TIPS-pentacene upwards of 200 K with the ferroelectric dielectric, while an activated transport is observed with non-ferroelectric dielectrics. We …
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Ultrahigh resolution surface phononics
Phonons are one of the most important quasiparticles in condensed matter physics; they influence a wide range of physical properties ranging from thermal and electrical conductivity to the propagation of sound. Phonons are also crucial to emerging research fields such as quantum information and …
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Development of physical models for the mesoscopic simulation of gas-surface interactions
… the mesoscopic and macroscopic simulation of gas-surface interactions relevant for hypersonics and high-temperature aerothermodynamic applications. Both nonreactive and reactive interactions are considered with a special focus on desorption. The aim of the work is to employ microscopic information …