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 12 of 12 for “"Electron and phonon"”.
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Exploring electron and phonon transport at the nanoscale for thermoelectric energy conversion
… direct heat to electricity energy conversion and are ideal for waste heat recovery applications due to their simplicity, reliability, and lack of environmentally harmful working fluids. Recently, nanostructured thermoelectrics have demonstrated remarkably enhanced energy conversion …
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Theory of electron and phonon transport in nano and molecular quantum devices : design strategies for molecular electronics and thermoelectricity
Understanding the electronic and phononic transport properties of junctions consisting of a scattering region such as a nanoscale region or molecule connected two or more electrodes is the central basis for future nano and molecular scale applications. The theoretical and mathematical techniques to …
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Photophysics of carbon nanotubes
… of single-wall carbon nanotubes. Studying the electronic and vibrational properties of carbon nanotubes, we find that carbon nanotubes less than 1 nm in diameter exhibit dramatic changes in their electron and phonon dispersion relations due to the curvature of the nanotube sidewall and the …
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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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Nanoscale heat conduction with applications in nanoelectronics and thermoelectrics
… scales are comparable to the mean free path and wavelength of energy carriers (electrons, photons, phonons, and molecules) or the time of interest is on the same order as the carrier relaxation time, conventional heat transfer theory is no longer valid. Tremendous progress has been made in …
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Real-Time Dynamics of Electrons and Phonons from First Principles
… solids far from equilibrium, producing transient electronic and lattice states that cannot be described by equilibrium theories or phenomenological models such as the two-temperature model. This dissertation develops and applies a real-time, ab initio framework based on the time-dependent …
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Effects of vacancies and electron temperature on the electron phonon coupling in cubic silicon carbide and their connection to the inelastic thermal spike
<p>“The electron-phonon interaction is an important interaction in many solids as it influences transport phenomena and related quantities such as the electrical and thermal conductivities, especially in nuclear and space applications. The importance of the electron-phonon interaction in primary …
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Ab initio study of electron transport in lead telluride
… the experimental progress, current understanding of the electron transport in PbTe is based on either band structure simulated using first-principles in combination with constant relaxation time approximation or empirical models, both requiring adjustable parameters obtained by fitting …
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Phonon and electron transport through interfaces and disordered structures
Understanding phonon and electron transport is of great significance for designing efficient solid-state devices such as transistors, laser diodes and thermoelectric energy converters. The structural randomness is inevitable in solid-state devices, and it is often regarded as the undesirable …
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Study of electrical and thermal transport in low-dimensional structures aiming for improving thermoelectric efficiency
… from industries, residential processes, and transportation. However, thermoelectric efficiency has been limited to a non-practical range because of the interplay among transport coefficients which measure the efficiency. With widely growing interest in thermoelectrics, understanding the …
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Quantum theory of electronic and thermal transport through nano-scale and single-molecule devices
This thesis presents a series of studies into the electronic, thermal and thermoelectric properties of molecular junctions containing single organic molecules. The exploration and understanding the electronic and phononic characteristics of molecules connected to metallic leads is a vital part of …
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Functional materials for thermal regulation
… for the control of heat dissipation and regulation is a fundamental step to improve the performance in many engineering systems. This dissertation presents experimental studies of heat conduction in distinctive thermal functional materials with an emphasis on advancing understanding …