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 58 for “"tunneling spectroscopy"”.
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Tunneling spectroscopy of magnetic tunnel junctions
In this thesis, magnetic tunnel junctions based on MgO barriers have been prepared and investigated. Different aspects were discussed, in order to understand the physical limitations to the TMR ratio of the MTJs and, hence, their performance as a basis of spintronic devices.
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Tunneling spectroscopy in p-type silicon
Tunneling in boron doped p-type silicon metal-semiconductor and metal-insulator-semiconductor tunnel junctions has been studied at low temperatures by measuring the derivatives, di/dV and d2i/dV2, of the current-voltage characteristics as functions of applied bias voltage V. The junctions were …
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Superconducting tunneling spectroscopy of low-dimensional materials
… materials. In graphene, non-equilibrium tunneling spectroscopy was used to show that phonon-electron interactions was the mechanism to cool electrons. For InSb nanowires, a method of fabricating clean, ordered metallic contacts was found and was extended to create superconducting tunnel …
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Tunneling spectroscopy of highly ordered organic thin films
… arrangement was characterized in Scanning Tunneling Microscopy and Low Energy Electron Diffraction investigations. Scanning Tunneling Spectroscopy data were recorded on monolayer and submonolayer PTCDA films. Measurements on closed PTCDA layers at different fixed tip sample separations …
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Superconducting tunneling spectroscopy of graphene and graphene nanostructures
… dissertation is concerned with superconducting tunneling spectroscopy of graphene and nanostructures in two dimensional materials. The technique of tunneling spectroscopy via a planar superconducting probe is developed based on a well-formed self-limited tunnel barrier created only between the …
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Tunneling spectroscopy of the two-dimensional electron gas
… technique that we call "Time Domain Capacitance Spectroscopy" (TDCS), we measure the complete current-voltage characteristics for tunneling into the 2DES without making ohmic contacts to it. TDCS detects the tunneling current in regimes difficult to access by conventional methods, such as when …
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Tunneling spectroscopy of carbon nanostructures: a romance in many dimensions
… we present results from various methods of tunneling spectroscopy in carbon nanotubes, which shed light on electron – electron interaction in carbon nanotubes and low dimensional systems in general. We also apply those methods to two dimensional graphene sheets. We first review the …
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Scanning tunneling spectroscopy of lead-substituted bismuth strontium copper oxide
… correlation with Pb location. Differential tunneling conductance is modeled using the van Hove scenario, wherein modulated regions are shown to have higher values of EVHS than flat regions. The consistency of parameters matching theoretical predictions to tunneling spectra suggest that EVHS …
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Exploring the strongly correlated realm of electrons using scanning tunneling spectroscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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The determination of semiconductor band gap structure and surface states using tunneling spectroscopy.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1971. Ph.D.
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Planar Tunneling Spectroscopy of Thin-Film Niobium, Niobium/normal Metal and Niobium/semicondutor Structures
… between these two materials was utilized as a tunneling barrier. A method was developed to fabricate small area junctions. The tunneling conductance as a function of semiconductor properties and sample temperature have been found to be consistent with results reported in the literature.
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Planar tunneling spectroscopy of thin-film Nb, Nb/normal metal and Nb/semiconductor structures
… between these two materials was utilized as a tunneling barrier. A method was developed to fabricate small area junctions. The tunneling conductance as a function of semiconductor properties and sample temperature have been found to be consistent with results reported in the literature.
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Design and fabrication of electron energy filters for room temperature inelastic electron tunneling spectroscopy
… and non-portability. Inelastic electron tunneling spectroscopy (IETS) is an all electronic spectroscopy that has been extensively used to measure the vibrational modes of molecules and can be used for electronic nose application. It has several advantages such as ultra-high sensitivity …
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Growth, transport, and tunneling spectroscopy of Y1̳-̳x̳Prx̳Ba2̳Cu3̳07̳ thin films as a function of crystallographic orientation
The planar tunneling spectroscopy of superconducting, Pr-doped YBa2Cu301 thin films is reported. The tunneling conductance is studied as a function of both crystallographic orientation and Pr concentration. Tunnel junctions are fabricated on thin films grown by off-axis magnetron sputter deposition …
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Growth, Transport, and Tunneling Spectroscopy of Y(1-X) Pr(x) Ba(2) Cu(3) O(7) Thin Films as a Function of Crystallographic Orientation
The planar tunneling spectroscopy of superconducting, Pr-doped YBa$\rm\sb2Cu\sb3O\sb7$ thin films is reported. The tunneling conductance is studied as a function of both crystallographic orientation and Pr concentration. Tunnel junctions are fabricated on thin films grown by off-axis magnetron …
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Morphology, structure and electronic properties of CdTe surfaces studied by scanning tunneling microscopy
A scanning tunneling microscope has been used to study the surface properties of CdTe crystals. Coupled with scanning tunneling spectroscopy (STS) and atomic force microscopy, the surface morphology, structure and electronic properties of CdTe and CdZnTe surfaces have been studied. We have …
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Spectroscopic studies of high-temperature superconductors on planar tunnel junction devices and nanofabricated point contact junctions
… Two powerful methods for this investigation are tunneling spectroscopy and point contact spectroscopy. The tunneling spectroscopy directly probes the density of states whereas the point contact spectroscopy detects the sample properties via quasiparticle scattering. Two new approaches to …
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Electronic characterization of solution-synthesized graphene nanoribbons using scanning tunneling microscopy
… side chains are also presented using scanning tunneling spectroscopy in a room temperature scanning tunneling microscope. The initial findings of the chevron/7A GNR with functionalized side chains are presented as the building blocks towards combining DNA origami and GNR precursors. Finally, a …
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Investigation of quasi-one-dimensional orthorhombic tantalum trisulfide using scanning tunneling microscopy
… However, this study presents the first scanning tunneling microscope imaging of two-dimensional flakes of TaS3. To study this material, we first modified a preparation tool on the microscope, and cleaned the microscope vacuum system to enable imaging at ultra-high vacuum. We achieved …
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