Measuring, Interpreting and Translating Electron Quasiparticle - Phonon Interactions on the Surfaces of the Topological Insulators Bismuth Selenide and Bismuth Telluride: Springer Theses
Autor Colin Howarden Limba Engleză Hardback – 24 oct 2016
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Specificații
ISBN-13: 9783319447223
ISBN-10: 331944722X
Pagini: 103
Ilustrații: XV, 88 p. 41 illus., 33 illus. in color.
Dimensiuni: 155 x 235 x 8 mm
Greutate: 0.33 kg
Ediția:1st ed. 2016
Editura: Springer International Publishing
Colecția Springer
Seria Springer Theses
Locul publicării:Cham, Switzerland
ISBN-10: 331944722X
Pagini: 103
Ilustrații: XV, 88 p. 41 illus., 33 illus. in color.
Dimensiuni: 155 x 235 x 8 mm
Greutate: 0.33 kg
Ediția:1st ed. 2016
Editura: Springer International Publishing
Colecția Springer
Seria Springer Theses
Locul publicării:Cham, Switzerland
Cuprins
Introduction.- Properties of Bi2Se3 and Bi2Te3.- Helium atom-surface scattering (HASS).- Experimental Apparatus and Technique.- Pseudocharge phonon model.- HASS results from the surface of Bi2Se3 and Bi2Te3.- Translating between electron and phonon perspectives.- Conclusion and future directions.- Appendices.
Notă biografică
Dr Colin Howard was awarded a PhD from Boston University in 2015. In 2012 he received the Gertrude and Maurice Goldhaber Award for Excellence in Physics Research, awarded annually to a single graduate student at Boston University for making exceptional contributions to research in their first year of graduate study.
Textul de pe ultima copertă
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 λν(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 λ from the DF perspective.
Caracteristici
Nominated as an outstanding PhD thesis by Boston University, the author was also the recipient of the Gertrude and Maurice Goldhaber Award for Excellence in Physics Research Describes the first calculation of phonon mode-specific Dirac fermion coupling ??(q) from experimental data, underscoring the strong coupling between optical surface phonons and surface Dirac fermions in topological insulators Presents calculation of the DF spectral function and density of states, allowing for comparison with photoemission and scanning tunneling spectroscopies Includes supplementary material: sn.pub/extras