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 59 for “"surface state"”.
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Satellite Microwave Remote Sensing of Boreal-Arctic Land Surface State and Meteorology from AMSR-E
… component of the Earth’s climate system. Near-surface vapor pressure deficit, soil temperature, and soil moisture are essential state variables for monitoring high latitude climate and estimating the response of terrestrial ecosystems to climate change. Methods are developed and evaluated to …
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Satellite Microwave Remote Sensing of Boreal-Arctic Land Surface State and Meteorology from AMSR-E
… component of the Earth’s climate system. Near-surface vapor pressure deficit, soil temperature, and soil moisture are essential state variables for monitoring high latitude climate and estimating the response of terrestrial ecosystems to climate change. Methods are developed and evaluated to …
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Estimating Soil Moisture and Energy Fluxes Using Assimilation of Remotely Sensed Land Surface State Variables
… model physics representation in the land surface models predicting these fluxes, better predictions can be obtained by assimilating hydrologically relevant remotely sensed data into the predictive models. We consider two approaches. In the first approach, we update the soil moisture …
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Photoemission Studies of Thin Metallic Overlayer Systems
… 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, and a bare Cu(332) stepped surface. Monolayer overlayers that are incommensurate with the substrate Ag on Ni(001), Ni(111), and Cu(111) or …
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Photoemission studies of thin metallic overlayer sytems
… 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 Ag, and a bare Cu(332) stepped surface. Monolayer overlayers that are incommensurate with the substrate [Ag on Ni(OOl), Ni(lll), and Cu(lll)] or …
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Photoemission studies of surfaces and thin film systems of silver and gold
… buried in Ag(lll). Properties of a zone-center surface state were also investigated with the use of angle resolved photoemission spectroscopy for many related systems: the clean Ag(lll) surface, Ag overlayers on Au(lll), and Au overlayers on Ag(lll). For Au epitaxial overlayers on Ag, the …
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The surface effects of alkali halides in the infrared
"The surface state extension of the shallow donor theory is reviewed. The surface state theory and its applications to F-centers of alkali halides is presented. Experimental infrared data show an absorption which seems to correspond with the ground state to first excited state transition. Surface …
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Investigations of electron scattering mechanisms at the silicon-silicon dioxide interface
… silicon-silicon dioxide interface. Theoretical surface conductivity mobility in a semiconductor space-charge region for the temperature range 1000K to 4000K was calculated using a classical Boltzmann-Fuchs equation with constant field and constant relaxation time approximations. The surface …
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Scanning tunneling microscopy and spectroscopy of topological materials with broken symmetry
… channels obscure the physics of the topological surface states. Chemical tuning has been used previously to counteract this parasitic conductivity. However, many details of the process are not well understood and the conditions required to produce optimal samples are not yet well established. In …
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Electrochemical studies of pyrite and galena
… that a unique potential exists at which a fresh surface of pyrite undergoes neither oxidation nor reduction. This potential is pH dependent and is referred to as the "stable" potential. The stable potential was found to be 0 V at pH 4.6 and -0.3 V at pH 9.2. Fresh, unoxidized pyrite surfaces were …
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Terahertz Spectroscopy of Topological Insulators and other 2-Dimensional Materials
… and isolating the response from the topological surface state (TSS) in TIs, which are “robust”, as it is protected against backscattering by spin− momentum locking and time reversal symmetry. Various literature reports describing the current understanding of the TI field are then discussed. This …
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Surface embedded green function method applied to Ag(111).
… self-consistent calculations utilizing the Surface Embedded Green Function (SEGF) method have been performed on the Ag(111) surface. Analysis of the surface energetics reveal an energy minimum in the low temperature limit at an outerlayer contraction of 0.5% which agrees well with low energy …
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Self-assembly of amino acids on noble metal surfaces : morphological, chemical and electronic control of matter at the nanoscale
… acids on the monocrystalline Ag(111) and Cu(111) surfaces are characterized by means of scanning tunneling microscopy (STM) and spectroscopy (STS), helium atom scattering (HAS), x-ray photoelectron spectroscopy (XPS) and near-edge x-ray absorption fine structure (NEXAFS) in ultrahigh vacuum (UHV). …
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A nanoscale probe of the quasiparticle band structure for two dimensional electron systems
… density waves, and other ordered phases on the surfaces and interfaces of these 2D materials are governed by interactions which can be experimentally tuned with increasing precision. This motivates the need to develop spectroscopic probes that are sensitive to these tuning parameters, with the …
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Modelling of Berry phase and Fermi-level topologies for emergent quantum phenomena prediction in selected solid state systems
Topological materials host electronic states that remain robust against perturbations and offer routes to novel quantum functions. This thesis investigates three representative compounds - SrSi2, CoSi, and NbP - to reveal how external stimuli, namely tensile strain and electric fields, tune their …
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Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials
… coupling are of particular interest in solid state physics as an avenue for observing and manipulating spin physics using standard electrical techniques. This dissertation focuses on the characteristics of elemental bismuth (Bi), which exhibits some of the strongest intrinsic spin-orbit …
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Low Density 2D-Electron Sheets on Liquid 3He Surfaces
… work, experiments with electron mobility on the surface of 3He were carried out. Mobility measurements were done in the temperature range 0.6-600mK, the operating frequencies 1Hz-100kHz, the excitation voltage 4mV - 1V and pressing electrical fields 0-255V/cm on the top electrode and 0-47.5V/cm …
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Spectral properties of strongly correlated electron systems
… results on the band structure and the Fermi surface of Nd{2-x}Ce_xCuOCl_{4-\delta} are naturally obtained within the t-t-U Hubbard model without further need for readjustment or fitting of parameters, as proposed in recent theoretical considerations. We present a theory for the photon energy …
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Topological phases in narrow-band systems
… proposal builds upon this system: as the ground state is a fractional quantum Hall state, excitations of this state are anyons when there is an incommensurate filling. The underlying lattice allows access to a new regime in which the anyon gas can form a charged superfluid, including states with …
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