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Books > Science & Mathematics > Physics > States of matter > Condensed matter physics (liquids & solids)
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Measuring, Interpreting and Translating Electron Quasiparticle - Phonon Interactions on the Surfaces of the Topological Insulators Bismuth Selenide and Bismuth Telluride (Paperback, Softcover reprint of the original 1st ed. 2016)
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Measuring, Interpreting and Translating Electron Quasiparticle - Phonon Interactions on the Surfaces of the Topological Insulators Bismuth Selenide and Bismuth Telluride (Paperback, Softcover reprint of the original 1st ed. 2016)
Series: Springer Theses
Expected to ship within 10 - 15 working days
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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.
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