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 21 for “"electron-phonon interactions"”.
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Electron-phonon interactions in double layer graphene superfluids
As the scaling of electronic devices continues to decrease, the search for a low- power replacement for complementary metal-oxide semiconductor (CMOS) logic becomes increasingly important. A predicted room temperature phase transition from Fermi liquid to Bose-Einstein condensate of excitons in …
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Lattice dynamics and electron/phonon interactions in epitaxial transition-metal nitrides
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-09-29 without embargo terms
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Probing electron-electron and electron-phonon interactions in twisted bilayer graphene
… I present three experiments which explore electron-electron and electron-phonon interactions in SA-TBG. I first consider SA-TBG as a host for a viscous electron fluid and look for the onset of fluid behavior via electron transport. Then I investigate the temperature dependence of …
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Single-electron transport and electron-phonon interactions in graphene heterostructured self-assembled molecular solid-state devices
… electrode. The first project focuses on single-electron phenomena in finger-design and microwell devices, such as the Coulomb staircase, accompanied by three distinct types of negative differential resistance, hysteresis, and random telegraph noise. Devices were fabricated using 5 nm and 2 nm …
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Light-matter interactions of two-dimensional materials and the coupled nanostructures
… unique and extraordinary electrical and optoelectronic properties. These properties can be largely attributed to the fundamental light-matter interactions. This thesis project uses spectroscopy techniques and focuses on the study of the light-matter interaction in 2D materials, as well as …
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Theoretical studies of electron dynamics and relaxation in photoexcited quantum well structures
… play an essential role in the field of optoelectronics. This thesis focuses on the quantum mechanical aspects of electron dynamics and relaxation (or capture) in QW structures with particular attention paid to understanding and interpreting the results from the various optical experiments …
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Reducing extrinsic damping of surface acoustic waves at gigahertz frequencies
… sensors as well as enable them to better probe phonon and electron-phonon interactions near surfaces. It is not clear from existing experiments which mechanisms dominate damping at high frequencies. We calculate damping times of SAWs due to various mechanism in the 1-100 GHz range to find that …
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The Influence of Defects on the Vibrational and Electronic Properties of the Quasi 1D van der Waals Magnet CrSBr
… to explore low dimensional magnetism, magneto-electronic coupling, and the design of novel magnetic phases through defect engineering. The 2D semiconducting antiferromagnet CrSBr has generated recent attention because of its correlated magnetic, optical, and electronic properties, air …
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Electrical Response of Carbon Nanotubes Under Electrolyte
… carrier transport, current fluctuations, and electron-phonon interactions have been explored by utilizing electrolyte top gated carbon nanotube based devices. Individual semiconducting nanotubes have shown a negative threshold voltage shift at low pHs. The potential offsets induced by surface …
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Novel transport regimes in graphene
… due to a rich and complex interplay between electron-disorder, electron-electron, and electron-phonon interactions. Graphene, a newly discovered carbon one-atom-thick material, has unique transport characteristics, some of which are already well understood, whereas some are being under …
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Computational Studies of Correlated Electrons in One-Dimension
… for spin-1/2 fermions and the inclusion of electron-phonon interactions in the Stochastic Series Expansion Quantum Monte Carlo method and the use of Quantum Parallel Tempering to improve the quality of the numerical data. For the extended Hubbard model at half-filling, we have confirmed the …
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Angle resolved photoemission studies of silver bromide
… in order to stop sample photolysis and decrease electron-phonon interactions. Asymmetry parameters as well as relative cross sections were determined for the valence bands of Ag and AgBr from 55eV through the Ag 4d Cooper minimum at 140eV. Comparison of asymmetry parameters with atomic data …
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MBE growth and STM study of chalcogenide thin films
… in this dissertation have been film-substrate interactions, through strain, through phonons, through charge transfer, through Moiré patterns. In the first main chapter, we explore the growth of a monolayer of tin diselenide on highly oriented graphite. It exhibits a gap in the density of …
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Magnetoconductance and Dynamic Phenomena in Single-Electron Transistors
<p>The quantum mechanical nature of electrons at very low temperatures has posed interesting results in the resistivity of metals over the last century. When the temperature nears absolute zero, the resistivity due to electron-electron interactions and electron-phonon interactions become very small …
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Electronic, thermoelectric and optical properties of vanadium oxides: VO2, V2O3 and V2O5
Correlated electrons in vanadium oxides are responsible for their extreme sensitivity to external stimuli such as pressure, temperature or doping. As a result, several vanadium oxides undergo insulator-to-metal phase transition (IMT) accompanied by structural change. Unlike vanadium pentoxide …
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Nanoscale electron, phonon and spin transport in thermoelectric materials
… of fundamental energy carriers, such as electrons and phonons in most semiconductors, and magnons in magnetic materials. These understandings have been achieved through the development of both first-principles simulations and experimental spectroscopic tools, in particular for phonon …
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Electron tunneling into superconducting mercury films below one degree Kelvin
… on the strong-coupling theory. The effective phonon spectrum and the complex energy gap function for mercury are thereby derived. Values for the electron self energy function, the electron renormalization function, Coulomb pseudopotentia1, and the electron-phonon interaction constant are also …
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Low Temperature Single-Crystal X-ray Diffraction on A(1-x)A'xMnO3 (A=La,Eu and A'=Ba,Sr)
… behavior (and its correlation to magnetic and electronic properties) of rhombohedral La0.815Ba0.185MnO3 and orthorhombic La0.89Sr0.11MnO3 in dependence on temperature, the studies of the monoclinic symmetry of La0.815Ba0.185MnO3 at T=160K and the evidences of the splitting of the A-site in …
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CEF-phonon interactions in rare earth sesquioxides: pressure-, temperature-, and magnetic field-dependent Raman scattering studies
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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