Electron-phonon interactions in low-dimensional structures, Lawrence Challis

Автор: Howard
Название: Measuring, Interpreting and Translating Electron Quasiparticle - Phonon Interactions on the Surfaces of the Topological Insulators Bismuth Selenide and Bismuth Telluride
ISBN: 331944722X ISBN-13(EAN): 9783319447223
Издательство: Springer
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Цена: 104480.00 T
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Описание: The thesis presents experimental and theoretical results about the surface dynamics and the surface Dirac fermion (DF) spectral function of the strong topological insulators Bi2Te3 and Bi2Se3. The experimental results reveal the presence of a strong Kohn anomaly in the measured surface phonon dispersion of a low-lying optical mode, and the absence of surface Rayleigh acoustic phonons. Fitting the experimental data to theoretical models employing phonon Matsubara functions allowed the extraction of the matrix elements of the coupling Hamiltonian and the modifications to the surface phonon propagator that are encoded in the phonon self-energy. This allowed, for the first time, calculation of phonon mode-specific DF coupling ??(q) from experimental data, with average coupling significantly higher than typical values for metals, underscoring the strong coupling between optical surface phonons and surface DFs in topological insulators. Finally, to connect to experimental results obtained from photoemission spectroscopies, an electronic (DF) Matsubara function was constructed using the determined electron-phonon matrix elements and the optical phonon dispersion. This allowed calculation of the DF spectral function and density of states, allowing for comparison with photoemission and scanning tunneling spectroscopies. The results set the necessary energy resolution and extraction methodology for calculating ? from the DF perspective.

Автор: Shinde, Subhash L.
Название: Length-scale dependent phonon interactions /
ISBN: 1461486505 ISBN-13(EAN): 9781461486503
Издательство: Springer
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Цена: 139310.00 T
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Описание:

Preface
Chapter 1: Theoretical Studies of Dimensionality and Symmetry Dependence of Phonons
Chapter 2: Phonons in bulk and low-dimensional systems
Chapter 3: Theories of Phonon Transport in Bulk and Nanostructed Solids
Chapter 4: First-principles determination of phonon lifetimes, mean free paths, and thermal conductivities in crystalline materials: pure silicon and germanium
Chapter 5: Ab Initio Thermal Transport
Chapter 6: Interaction of thermal phonons with interfaces
Chapter 7: Time-resolved phonon spectroscopy and phonon transport in nanoscale systems
Chapter 8: Semiconductor superlattice sasers at terahertz frequencies: design, fabrication and measurement
Chapter 9: Acoustic carrier transport in GaAs nanowires
Index