Global ETD Search
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 35 for “"Angle-resolved photoemission spectroscopy"”.
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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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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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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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Surface studies of group IV-VI layered crystals
… for TiS2e and 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 …
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Light-induced States and Phase Transitions in Quantum Materials investigated by Photoemission Spectroscopy and Epitaxial Synthesis
… For these 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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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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Nonlinear optical and photoemission spectroscopies of quantum materials
… second harmonic 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 …
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Exploring strongly interacting gapless states : cuprates, pair density waves, and fluctuating superconductivity
… predictions with existing experiments on angle-resolved photoemission spectroscopy (ARPES), infrared conductivity, diamagnetism, and lattice symmetry breaking. The material presented here is based on Ref. [38, 41, 40]. Ref. [39] is not discussed in this thesis but was completed during my …
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Angle-resolved photoemission and first-principles studies of topological thin films
… In this thesis research, the combination of angle-resolved photoemission spectroscopy (ARPES) and first principles calculation is used to examine the electronic properties of topological thin films and 2D electronic systems with large spin-orbit splitting. The topological thin films are …
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Angle-Resolved Photoemission Studies on the Many-Body Effects of High-Temperature Superconductor: Bi-2212
… a stable photon-energy helium lamp–based ARPES (angle-resolved photoemission spectroscopy) system with high energy resolution to extract detailed single-particle spectral functions in Bi-2212. Using these spectral functions, we reconstructed both the non-interacting and interacting spin …
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Photoemission Studies of Thin Metallic Overlayer Systems
Angle-resolved photoemission spectroscopy was used to study Ag(111) monolayers on six different substrates: Ni(001), Ni(111), Cu(001), Cu(111), Au(111), and Si(111)-(7x7). The properties of surface states were also examined for several related systems: Cu(111) covered by various thicknesses of Ag, …
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Photoemission studies of thin metallic overlayer sytems
Angle-resolved photoemission spectroscopy was used to study Ag(lll) I monolayers on six different substrates: Ni(OOl), Ni(lll), Cu(OOl), Cu(lll), Au(lll), and Si(lll)-(7x7). The properties of surface states were also examined for several related systems: Cu(lll) covered by various thicknesses of …
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The role of inter-plane interaction in the electronic structure of high Tc cuprates
… respect to interlayer coupling done by using the angle-resolved photoemission spectroscopy (ARPES), which is a leading technique in the experimental investigation of the single particle excitations in solids. The results presented in this work indicate a very different origin for the observed …
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Atomic and electronic structure of bulk intermetallic and heteroepitaxially grown surface alloys
… techniques, scanning tunneling microscopy and angle-resolved photoemission spectroscopy, which reveal the atomic and electronic structure of bimetallic systems, respectively. In the first system detailed herein, the surfaces of the ordered intermetallic alloy FeAl(110) exhibit surface …
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Photoemission studies of interface effects on thin film properties
… These properties are probed experimentally with angle-resolved photoemission spectroscopy using vacuum ultraviolet synchrotron radiation. An analysis of the measured quantum well energy levels and peak widths determines the height of the Schottky barrier, the rectifying energy barrier at a …
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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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Angle-resolved photoemission studies of two-dimensional electron systems
… importance. The major experimental tool is angle-resolved photoemission spectroscopy, which can directly measure the spectral function of the quasiparticle. The study of ultrathin metallic films focuses on the substrate effect on the electronic structure of the film. Thin metallic films can …
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Angle-resolved photoemission studies of thin-film topological materials
… materials are studied by a combined method of angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. We have studied the electronic structure of Bi2Te3 films using ARPES with circularly-polarized lights. Our ARPES results show a thickness-dependent electronic …
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Coherent light-matter interactions in monolayer transition-metal dichalcogenides
… technique using a transient absorption spectroscopy on MoS2 and WS2, and a newly developed XUV light source for time and angle-resolved photoemission spectroscopy (TR-ARPES) on WSe2 and WTe 2 Hybridizing the electronic valleys with light allows us to optically tune their energy levels in …
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Photoemission Spectroscopy Studies of New Topological Insulator Materials
… in position-space is related to the spin-resolved structure of electrons in energy- and momentum-space. We will discuss this relationship as it is probed through spin- and angle-resolved photoemission spectroscopy experiments on three topological (Bi₂)m(Bi₂Se₃)n superlattices: (a) Bi₂Se₃ …
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