Übersicht			Auf mobile öffnen

Lieferstatus:	Auf Bestellung (Lieferzeit unbekannt)
Veröffentlichung:	Oktober 2016
Genre:	Naturwissensch., Medizin, Technik
	Applied optics / B / Interfaces (Physical sciences) / Laser / Lasers / Materials science / Materials—Surfaces / Microscopy / Optical physics / Optics, Lasers, Photonics, Optical Devices / Photonics / Physics and Astronomy / Scientific equipment, experiments & techniques / spectroscopy / Spectroscopy and Microscopy / Spectrum analysis, spectrochemistry, mass spectrometry / Surface and Interface and Thin Film / Surface and Interface Science, Thin Films / Surface chemistry & adsorption / Surfaces (Physics) / Surfaces and Interfaces, Thin Films / Surfaces, Interfaces and Thin Film / Thin films mehr...
ISBN:	9783319447223
EAN-Code:	9783319447223
Verlag:	Springer EN
Einband:	Gebunden
Sprache:	English
Serie:	Springer Theses
Dimensionen:	H 235 mm / B 155 mm / D
Gewicht:	347 gr
Seiten:	88
Illustration:	XV, 88 p. 41 illus., 33 illus. in color., schwarz-weiss Illustrationen, farbige Illustrationen
Zus. Info:	EUDR exemption - product or manufacturing materials placed on the market prior to 31.12.2025.
Bewertung:	Titel bewerten / Meinung schreiben

Inhalt:

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.