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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 73 for “"Photoemission spectroscopy"”.
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Reaction dynamics studied by photoemission spectroscopy
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1984.
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Photoemission Spectroscopy Studies of New Topological Insulator Materials
… as it is probed through spin- and angle-resolved photoemission spectroscopy experiments on three topological (Bi₂)m(Bi₂Se₃)n superlattices: (a) Bi₂Se₃ (m = 0, n = 1), (b) Bi₄Se₃ (m = 1, n = 1), and (c) BiSe (m = 1, n = 2). Our studies have not only proven the topological nature of these materials, …
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Photoemission spectroscopy of germanium surfaces, interfaces, and germanium-silicon systems
High-energy electron diffraction and photoemission techniques providing controlled surface sensitivity were used to study several germanium surface and interface systems: the clean Ge(100)-(2xl) surface, the Ge(100)-Ag interface, and silicon-germanium systems. For the clean Ge(100)-(2xl) surface, …
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Angle-resolved photoemission spectroscopy studies of epitaxially-grown van der Waals ferromagnets
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Geometric and electronic structure of reconstructed semiconductor surfaces;high-resolution photoemission spectroscopy (PES)
The combination of high-resolution photoemission spectroscopy (PES) using synchrotron radiation and reflection high-energy electron diffraction (RHEED), along with other techniques, have been used to examine the atomic-scale geometric and electronic properties of clean and adsorbate-covered …
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Scanning tunneling microscopy and photoemission spectroscopy studies of clean and adsorbate-covered semiconductor surfaces
"Scanning tunneling microscopy (STM), photoemission spectroscopy, and a variety of other experimental techniques have been used to examine both the initial stages of interface formation between various adsorbates, as well as, reconstructions occurring on the clean surfaces of Si and Ge. The initial …
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Light-induced States and Phase Transitions in Quantum Materials investigated by Photoemission Spectroscopy and Epitaxial Synthesis
… studies, we employed time- and angle-resolved photoemission spectroscopy (trARPES) and molecular beam epitaxy (MBE). Through in-depth investigation into these phenomena, this thesis seeks to contribute to the broader understanding of light-matter interactions in quantum materials.
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Measuring the Electronic Structure of Atomically Uniform Silver Films Grown on Silicon Using Angle-Resolved Photoemission Spectroscopy
… effects, an important and troubling problem in photoemission spectroscopy. As a result, we are able to clearly identify, for the first time, many surface states buried in the pockets of the d-band manifold that had previously only been theoretically predicted.
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Characterisation of silicon nanoparticles produced by mechanical attrition using scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoemission spectroscopy
The establishment of printing technologies, using nanoparticle based inks, promises inexpensive manufacture of electronic devices. However, to produce working devices, nanoparticles have to meet requirements on size, shape, and composition. In the application of silicon nanoparticles in …
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Geometric and electronic structure of reconstructed semiconductor surfaces
The combination of high-resolution photoemission spectroscopy (PES) using synchrotron radiation, and reflection high-energy electron diffraction (RHEED), along with other techniques, have been used to examine the atomic-scale geometric and electronic properties of clean and adsorbate-covered …
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Photoemission and photoelectron diffraction studies of semiconductor surfaces
… such as photoelectron diffraction (PED), photoemission extended fine structure (PEFS), and photoelectron holography (PEH), rely upon the measurement of the interference due to the photoelectron wave scattering from nearby atoms. The intensity oscillations in the data are analyzed by …
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Semiconductor electronic band alignment at heterojunctions of wurtzite aluminum nitride, gallium nitride, and indium nitride
… and InN semiconductors are measured by x-ray photoemission spectroscopy. The bands alignments are all found to be Type I, and the valence-band discontinuities are found to be:(UNFORMATTED TABLE OR EQUATION FOLLOWS)$$\vbox{\halign{#\hfil&&\qquad #\hfil\cr &$\rm\Delta E\sb{v}$\ (eV)\cr\cr GaN on …
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Surface studies of group IV-VI layered crystals
… TiS2 have been investigated by angle resolved photoemission spectroscopy. Excitation is provided by He I (21.2 eV) and He II (40.8 eV) ultraviolet radiation. The results indicate that TiSe2 a semimetal with a band overlap of less than 0.25 eV, while TiSi2 a semiconductor. These measured bands …
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Colloidal Cerium Oxide Nanoparticle: Synthesis and Characterization Techniques
… in only nonradiative transitions. The optical spectroscopy results show that the ceria samples have different ratios of Ce(III) ions to Ce(IV) ions, which is verified by x-ray photoemission spectroscopy (XPS).
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Photoemission studies of surfaces and thin film systems of silver and gold
Angle-integrated photoemission spectroscopy was used to study the properties of Au 4f7; 2 core level in several systems: Au overlayers on Ag(lll), Au overlayers on Ag(lOO), and an Au monolayer buried in Ag(lll). Properties of a zone-center surface state were also investigated with the use of angle …
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Investigation of Iron-Based and Topological Superconductors via Point-Contact Spectroscopy
I report results of point-contact spectroscopy (PCS) measurements preformed on a variety of superconductors which are predicted to exhibit unconventional Cooper pairing mechanisms. Point-contact spectra of the iron pnictide BaFe_{1-x}$Pt$_x$As$_2$ are consistent with a two-gap isotropic s-wave …
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Local Charging Behavior on GaN Surfaces
… and p-type samples. Surface treatments and photoemission spectroscopy (XPS) data confirm the presence and influence of the oxide layer on surface charging behavior. In the case of forward-bias charging, a small change in surface contact potential (0.1 – 0.3 eV) is observed that is primarily …
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Large-scale density functional theory study of van-der-Waals heterostructures
… structure of TMDC interfaces have reproduced photoemission spectroscopy observations, and have also provided an explanation for the coexistence of commensurate and incommensurate phases within the same crystal. Secondly, we have developed new functionality to be used in the future study of 2D …
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Photoemission study of some novel materials: rare earth/transition metal interface, Ba06K04BiO3 and AlPdMn
<p>Synchrotron radiation photoemission spectroscopy and low energy electron diffraction (LEED) are applied to explore several novel materials: (a) Ce epitaxial growth on W (110) surfaces; (b) Eu epitaxial growth on Ta (110) surfaces; (c) Sm epitaxial growth on Ta (110) surfaces; (d) …
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Nonlinear optical and photoemission spectroscopies of quantum materials
… generation (SHG) and time and angle-resolved photoemission spectroscopy (tr-ARPES) based on high harmonic generation can offer a unique pathway toward studying quantum materials in the context of broken symmetries and nonequilibrium electronic structure, respectively. In particular, we …
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