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Item Details
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MEASURING, INTERPRETING AND TRANSLATING ELECTRON QUASIPARTICLE - PHONON INTERACTIONS ON THE SURFACES OF THE TOPOLOGICAL INSULATORS BISMUTH SELENIDE AND BISMUTH TELLURIDE
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| By: |
Colin Howard |
| Format: |
Hardback |
| List price:
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£99.99 |
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We currently do not stock this item, please contact the publisher directly for
further information.
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| ISBN 10: |
331944722X |
| ISBN 13: |
9783319447223 |
| Publisher: |
SPRINGER INTERNATIONAL PUBLISHING AG |
| Pub. date: |
15 October, 2016 |
| Edition: |
1st ed. 2017 |
| Series: |
Springer Theses |
| Pages: |
88 |
| Synopsis: |
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 lambdanu(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 lambda from the DF perspective. |
| Illustrations: |
8 black & white illustrations, 33 colour illustrations, 40 colour tables, |
| Publication: |
Switzerland |
| Imprint: |
Springer International Publishing AG |
| Returns: |
Returnable |
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