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Kniha Measuring, Interpreting and Translating Electron Quasiparticle - Phonon Interactions on the Surfaces of the Topological Insulators Bismuth Selenide an COLIN HOWARD

Measuring, Interpreting and Translating Electron Quasiparticle - Phonon Interactions on the Surfaces of the Topological Insulators Bismuth Selenide an

Autor: COLIN HOWARD
Jazyk: Angličtina
Vazba: Brožovaná
Vydavatel: Springer International Publishing AG
Dostupnost: Skladem u dodavatele
Odesíláme za 10-18 dnů
2 703 Kč
The thesis presents experimental and theoretical results about the surface dynamics and the surface...

Informace o knize

Autor
COLIN HOWARD
Jazyk
Angličtina
Vazba
Kniha - Brožovaná
Vydáno
2018
Stránek
88
EAN
9783319831206
ISBN
9783319831206
Enbook ID
19784895
Vydavatel
Springer International Publishing AG
Hmotnost
1708
Rozměry
155 x 235 x 6

Kompletní popis

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 ni (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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