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Dissertations / Theses on the topic 'Phonon energy'

Author: Grafiati

Published: 7 July 2024

Last updated: 25 July 2025

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1

Hanna, Ann Catrina. "Energy resolved phonon scattering in glasses." Thesis, University of Glasgow, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280020.

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2

Ong, Pang-Leen. "PHONON-ENERGY-COUPLING-ENHANCEMENT EFFECT AND ITS APPLICATIONS." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/652.

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Silicon Oxide/Oxynitride (SiO2/SiON) has been the mainstream material used for gate dielectric for MOS transistors for the past 30 years. The aggressive scaling of the feature size of MOS transistor has limited the ability of SiO2/SiON to work effectively as the gate dielectric to modulate the conduction of current of MOS transistors due to excess leakage current dominated by direct quantum tunneling. Due to this constraint, alternative gate dielectric/high-k is being employed to reduce the leakage current in order to maintain the rate of scaling of MOS transistors. However, the cost involved

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3

Damart, Tanguy. "Energy dissipation in oxide glasses." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1189/document.

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L'atténuation d'ondes à basse et haute fréquences dans les verres n'est pas encore bien comprise en grande partie car les phénomènes à l'origine de cette dissipation varient grandement en fonction de la fréquence. L’existence de structures complexes et organisation multi échelle dans les verres favorise l'apparition de temps de relaxation allant de la seconde à la femtoseconde et de corrélation prenant place de l’Angström à la centaine de nanomètre. A basse fréquence, une meilleur compréhension de ces phénomènes de dissipation serait bénéfique à de nombreux domaines. Par exemple, les multi-cou

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4

Kulikowski, Anoushka. "Phonon studies of energy loss in vertical tunnelling structures." Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286990.

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5

Giltrow, M. "Phonon study of vertical resonant structures." Thesis, Lancaster University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337346.

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6

Sklan, Sophia Robin. "Dynamical tuning of phonon transport for information and energy control." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/103231.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 145-164).<br>Controlled transport of energy and information is of paramount importance. It remains challenging, however, partially from the difficulty in controlling their physical carriers. Steering electrons and photons is now routine, yet atomic vibrations (quantized as phonons) are hard to control. This is partly due to the centrality of phonons in the disordered transport of energy as heat, but even in ordered sound wave

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7

Chen, Dye-Zone A. (Dye-Zone Abraham) 1973. "Energy transmission through and along thin films mediated by surface phonon-polaritons." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42067.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 131-138).<br>Surface phonon-polaritons are hybrid electromagnetic modes that are the result of photons coupling to transverse optical phonons. Recently, these surface modes have received much renewed interest primarily due to the fact that micro-fabrication techniques can now routinely create structures at the

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8

Minnich, Austin Jerome. "Exploring electron and phonon transport at the nanoscale for thermoelectric energy conversion." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67593.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 147-155).<br>Thermoelectric materials are capable of solid-state 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 efficiencies, primarily due to a reduction in lattice thermal conductivit

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9

Mafra, Daniela Lopes. "Using inelastic scattering of light to understand the nature of electron-phonon interactions and phonon self-energy renormalizations in graphene materials." Universidade Federal de Minas Gerais, 2012. http://hdl.handle.net/1843/MPDZ-8Y4GEG.

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In the last decade, many theoretical and experimental achievements have been made in the physics of graphene. In particular, Raman spectroscopy has been playing an important role in unraveling the properties of graphene systems. In this thesis we use the Raman spectroscopy to study some effects of the electron-phonon coupling in monolayer and bilayer graphene and to probe the electronic and vibrational structure of bilayer graphene. Phonon self-energy corrections have mostly been studied theoretically and experimentally for phonon modes with zone-center (q = 0) wavevectors. Here, we combine Ra

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10

Sidorova, Mariia. "Timing Jitter and Electron-Phonon Interaction in Superconducting Nanowire Single-Photon Detectors (SNSPDs)." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22296.

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Die vorliegende Doktorarbeit beschäftigt sich mit der experimentellen Studie zweier miteinander verbundener Phänomene: Dem intrinsischen Timing-Jitter in einem supraleitendenden Nanodraht-Einzelphotonen-Detektor (SNSPD) und der Relaxation der Elektronenenergie in supraleitenden Filmen. Supraleitende Nanodrähte auf einem dielektrischen Substrat als mikroskopische Grundbausteine jeglicher SNSPDs stellen sowohl für theoretische als auch für experimentelle Studien komplexe Objekte dar. Die Komplexität ergibt sich aus der Tatsache, dass SNSPDs in der Praxis stark ungeordnete und ultradünne supralei

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11

Stanton, Nicola Marie. "Experimental studies of electron-phonon interactions in gallium nitride." Thesis, University of Nottingham, 2001. http://eprints.nottingham.ac.uk/14212/.

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This thesis presents an experimental investigation of the electron-phonon interaction in GaN. Bulk epilayers, grown by MBE, and AIGaN/GaN heterostructures, grown by MOCVD, have been studied. The energy relaxation rate for hot electrons has been measured over a wide range of temperatures, allowing both acoustic and optic phonon emission to be studied in GaN epilayers. Direct phonon measurements, both studying the emission and absorption processes, have been performed. Detection of phonons emitted when hot electrons relax their excess energy complements the measurements of relaxation rates. Abso

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12

Al-Jawhari, Hala A. "Study of energy loss by a hot two-dimensional electron gas." Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287252.

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13

Cross, Andrew John. "The electron-phonon interaction in GaAs/(AlGa)As quantum wells." Thesis, University of Nottingham, 2001. http://eprints.nottingham.ac.uk/14316/.

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This thesis presents a study of the electron-phonon interaction in two dimensional electron gases (2DEGs), by measuring of the acoustic phonon emission from a sequence of n-type doped GaAs/(AlGa)As quantum wells. Previous studies of emISSIon from 2DEGs confined in GaAs heterojunctions (Chin et al., 1984) have shown a surprising absence of longitudinal acoustic (LA) mode phonon emission, in contrast with theoretical studies (Vass, 1987) which predict that deformation potential coupled LA mode emission should dominate the energy relaxation processes. This may be attributed to the finite width of

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14

Hardikar, Rahul Padmakar. "Dynamic electron-phonon interactions in one-dimensional models." Diss., Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-11092007-143010.

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15

Zhou, Jiawei. "Ab initio simulation and optimization of phonon drag effect for lower-temperature thermoelectric energy." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100088.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 81-85).<br>In recent years, extensive efforts have been devoted to searching for materials with high thermoelectric (TE) efficiency above room temperature for converting heat into electricity. These efforts have led to significant advances with a record-high zT above 2. However, the pursuit of higher TE performance at lower temperatures for cooling and refrigeration applications receives much less attention. Toda

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16

Pentland, Ian Alisdair. "A phonon emission study of quasi-1D electron gases." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325695.

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17

Osborne, Daniel Josiah. "A Nanoengineering Approach to Oxide Thermoelectrics For Energy Harvesting Applications." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/36133.

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The ability of uniquely functional thermoelectric materials to convert waste heat directly into electricity is critical considering the global energy economy. Profitable, energy-efficient thermoelectrics possess thermoelectric figures of merit ZT â ¥ 1. We examined the effect of metal nanoparticle â oxide film interfaces on the thermal conductivity Îº and Seebeck coefficient Î± in bilayer and multilayer thin film oxide thermoelectrics in an effort to improve the dimensionless figure of merit ZT. Since a thermoelectricâ s figure of merit ZT is inversely proportional to Îº and directly pr

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18

Koster, Sophie Amelia. "Energy Levels and Dynamics of Tm²⁺ Doped into AMX₃ Salts." Thesis, University of Canterbury. Physics and Astronomy, 2014. http://hdl.handle.net/10092/9643.

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Divalent thulium has been doped into CsCaI₃, CsCaBr₃, CsCaCl₃ and RbCaI₃- a series of AMX₃ salts. Using previously published optical spectra, a series of parameterised energy level calculations have been performed. The calculated energy levels, optimised crystal field parameters and simulated optical absorption spectra are presented. Theoretical predictions yield excellent approximation to the experimental data. Temperature dependent fluorescent lifetimes from the (³F₄,t₂g) and (³H₆,t₂g) excited (emitting) states have been measured using a pulsed dye laser. For CsCaBr₃ and RbCaI₃ doped with

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19

Devitt, Andrew Maurice. "Time and angle resolved phonon absorption in the fractional quantum hall regime." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342525.

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20

Kaul, Pankaj B. "Thermal Transport in Tin-Capped Vertically Aligned Carbon Nanotube Composites for Thermal Energy Management." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1383515941.

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21

Pfau, Charlotte [Verfasser], S. [Akademischer Betreuer] Schweizer, R. [Akademischer Betreuer] Wehrspohn, and U. [Akademischer Betreuer] Rogulis. "Low phonon energy glass ceramics for efficient rare-earth luminescence / Charlotte Pfau. Betreuer: S. Schweizer ; R. Wehrspohn ; U. Rogulis." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1076503195/34.

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22

Guilloux, Victor. "Excitons in Lead Halide Perovskite Nanocrystal systems : In Depth Investigation of the Fine Structure, Phonon Interactions and Energy transfers." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS431.

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Au cours des dix dernières années, une nouvelle génération de nanocristaux (NCx) colloïdaux a émergé dans le paysage des boîtes quantiques semi-conductrices : les NCx pérovskite (PVK) d'halogénure de plomb. Des propriétés d'émission remarquables, combinées à une synthèse simple et économique, suscitent un engouement autour de ces matériaux et de leurs applications optoélectroniques. En effet, les NCx PVK montrent des rendements de photoluminescence (PL) très élevés, en grande partie grâce à leur structure de bande particulière et à la position des états de défauts au sein de celle-ci. De plus,

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23

Galparsoro, Larraza Oihana. "Phonon and electron excitations in diatom abstraction from metallic surfaces." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0417/document.

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La rationalisation des processus chimiques élémentaires aux surfacesest d'intérêt primordial pour de nombreux phénomènes naturels ou d'intérêttechnologique. D'un point de vue fondamental, la façon dont l'énergie, concomitanteà toute réaction chimique, est distribuée parmi les degrés de liberté des moléculesformées et/ou transférée à la surface est loin d'être systématisée. Dans ce travail,des simulations, reposant sur la méthode des trajectoires quasi-classiques (QCT),sont réalisées pour examiner cette problématique lors de recombinaisons demolécules d'hydrogène (H2) et d'azote (N2) résultant

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24

Vallerini, Barbosa Itália. "Nanocristaux oxydes luminescents pour le développement de nanosondes de température in vivo." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI125.

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Les changements thermiques biologiques sont des événements courants lors d'activités métaboliques cellulaires anormales. En effet, les aberrations thermiques – telles qu'une augmentation de la température locale des tissus – sont directement liées à la détection de zones enflammées, à la présence de tumeurs ou d'autres maladies. En plus de contribuer au diagnostic des maladies, la détermination de la température locale dans les systèmes biologiques peut également aider à leur traitement. Par exemple, dans l'hyperthermie, une élévation de température doit être induite dans les tissus tumoraux à

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25

Kennedy, Jermaine L. "Investigations of fiber optic temperature sensors based on Yb:Y3Al5O12." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001566.

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26

Swift, Angela Marion. "The development of a cryogenic phonon detector, based on the coupling of superconducting tunnel junctions to indium antimonide crystals : with applications in X-, #gamma#- and #beta#-ray spectroscopy antimonide." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294274.

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27

Timrov, Iurii. "Ab initio study of plasmons and electron-phonon coupling in bismuth: from free-carrier absorption towards a new method for electron energy-loss spectroscopy." Palaiseau, Ecole polytechnique, 2013. http://pastel.archives-ouvertes.fr/docs/00/82/37/58/PDF/thesis.pdf.

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Ce travail a été consacré à l'étude théorique du bismuth semi-métallique à l'aide de méthodes basées sur la théorie de la fonctionnelle de la densité (DFT). Les effets de couplage spin-orbite et d'échange et de corrélation dans l'approximation de densité locale (LDA) et de gradient généralisé (GGA) ont été approfondis de façon systématique. J'ai trouvé que les poches d'électrons et de trous au niveau de Fermi sont correctement décrites, ce qui m'a permis d'interpréter avec succés les expériences pompe-sonde dans le bismuth photoexcité menées au laboratoire des Solides Irradiés. Le calcul du co

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28

Wong, Basil T. "THERMAL HEAT TRANSPORT AT THE NANO-SCALE LEVEL AND ITS APPLICATION TO NANO-MACHINING." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_diss/387.

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Nano-manufacturing is receiving significant attention in industry due to the ever-growing interest in nanotechnology in research institutions. It is hypothesized that single-step or direct-write nano-scale machining might be achieved by coupling nano-probe field emission with radiation transfer. A laser may be used to heat a workpiece within a microscopic region that encloses an even smaller nanoscopic region subjected to a focused electron beam. The electron-beam supplies marginal heat sufficient to remove a minute volume of material by evaporation or sublimation. Experimentally investigating

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29

Hardikar, Rahul Padmakar. "Investigation of order parameters and critical coupling for the Peierls Extended Hubbard Model at one-quarter filling." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-11112004-120413.

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30

Hague, James P. "Band to Mott transition in the infinite dimensional Holstein model." Thesis, University of Warwick, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369426.

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31

Li, Yuting. "Simulations and Electronic Structure of Disordered Silicon and Carbon Materials." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1395410498.

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32

Mai, Thuc T. "Optical spectroscopy of cooperative phenomena and their symmetries in solids." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555629359625425.

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33

Berthou, Simon. "Etude opto-électronique des mécanismes de relaxation des électrons de haute énergie dans les hétérostructures en graphène." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC133/document.

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Dans cette thèse, nous étudions le couplage électron-phonon dans le graphène, et en particulier l’influence du substrat. Il s’agit de quantifier par des mesures opto-électroniques le couplage des électrons avec les modes de phonons du substrat, que ce soit les modes de phonons polaritons de surface (SPP) pour les substrats isotropes comme le SiO2 ou les modes de phonons polaritons hyperboliques pour les substrats fortement anisotropes comme le h-BN. Pour ce faire, nous commençons par une revue générale du couplage électron-phonon dans le graphène avant de détailler les différentes méthodes exp

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34

Wang, Yichun. "LEAKAGE CURRENT REDUCTION OF MOS CAPACITOR INDUCED BY RAPID THERMAL PROCESSING." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/640.

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With the MOSFET scaling practice, the performance of IC devices is improved tremendously as we experienced in the last decades. However, the small semiconductor devices also bring some drawbacks among which the high gate leakage current is becoming increasingly serious. This thesis work is focused on the of gate leakage current reduction in thin oxide semiconductor devices. The method being studied is the Phonon Energy Coupling Enhancement (PECE) effect induced by Rapid Thermal Processing (RTP). The basic MOS capacitors are used to check improvements of leakage current reduction after appropri

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35

Almutairi, Alanoud. "Electronic band structure equations and Fermi surface evolution from 2D materials to 3D layered superconducting compounds." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/134414/1/Alanoud%20Mulfi%20Z_Almutairi_Thesis.pdf.

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A simple approach for extracting the superconducting gap of materials from trendline fittings of key sections of their Electronic Band Structures (EBS), calculated using Density Functional Theory (DFT), is presented. The proposed approach works well for very different compositions, structure types and superconducting transition temperatures, indicating that it is robust, reliable and versatile. This approach provides many advantages in terms of required computational time and power, compared with similar information extracted from phonon dispersion calculations, making it accessible to wider D

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36

Light, Brandon W. "Energy-efficient photon mapping." Link to electronic thesis, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-051007-092224/.

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Thesis (M.S.) -- Worcester Polytechnic Institute.<br>Keywords: mobile devices; photon mapping; global illumination; ray tracing; energy; mobile; computer graphics. Includes bibliographical references (leaves 66-68).

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37

Jamison, John S. "Time and Space Resolved Spin-Heat Transport in the Magnetic Insulator Yttrium Iron Garnet." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586740671277489.

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38

Hamyeh, Sobhi. "Étude de transfert d’énergie par des excitations de surface." Thesis, Troyes, 2020. http://www.theses.fr/2020TROY0013.

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La taille des composants électroniques a récemment été réduite à quelques dizaines de nanomètres. Cette diminution perpétuelle de la taille des composants électroniques modernes et l’augmentation de leurs vitesses et fréquences de fonctionnement conduisent inévitablement à des points chauds, qui sont des dangers entrainant une défaillance du système s’ils sont laissés longtemps. Le premier objectif de cette thèse est d’optimiser des techniques efficaces et pratiques pour évacuer la chaleur des nano-composants électronique. Le deuxième objectif de cette thèse est de présenter des moyens pour co

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39

Hendry, D. "Jet production in photon-photon interactions." Thesis, University of Glasgow, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375434.

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40

Walker, Ian W. "Exclusive charged pion production in photon-photon interactions." Thesis, Lancaster University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305949.

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41

AYADI, MOHAMED. "Contribution a l'etude de la dynamique de reseau de quelques composes de la serie de la mathlockite (pbfcl)." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13183.

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Etude de l'energie de cohesion de composes a structure de mathlockite; conditions de stabilite, expressions de la polarisation ionique, des constantes d'elasticite et des constantes dielectriques (modele de la coquille, presence de sites non centrosymetriques). Condition de synthese et de croissance cistalline de cahcl, bafcl, pbfcl et biocl; spectres raman et ir. Analyse des spectres de reflexion ir de bafcl (kramers-kronig et oscillateur classique). Determination de la densite d'etats et de la dispersion de phonons pour bafcl; calcul de certaines constantes d'elasticite

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42

Kang, Ji-Hwan. "Energy transfer enhancement of photon upconversion systems for solar energy harvesting." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45846.

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Photon energy upconversion (UC), a process that can convert two or more photons with low energy to a single photon of higher energy, has the potential for overcoming the thermodynamic efficiency limits of sunlight-powered devices and processes. An attractive route to lowering the incident power density for UC lies in harnessing energy transfer through triplet-triplet annihilation (TTA). To maximize energy migration in multicomponent TTA-assisted UC systems, triplet exciton diffusivity of the chromophores within an inert medium is of paramount importance, especially in a solid-state matrix for

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43

Selig, Marco. "Information theory based high energy photon imaging." Diss., Ludwig-Maximilians-Universität München, 2015. http://nbn-resolving.de/urn:nbn:de:bvb:19-178899.

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44

Bertrand, Martine 1976. "Photon production in high energy heavy ion collisions." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31196.

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The production of photons in the energy range of 0 to 3 GeV is discussed as a signature of the creation of a quark-gluon plasma in ultrarelativistic nuclear collisions. However, they are also created in the hadronic phase. Therefore I investigate the role of the pirho → pigamma and pio → pigamma reactions in the photon emission from hot hadronic matter, and I compare their respective importance. These reactions are known to be the leading contributions. For this purpose I use diverse effective chiral Lagrangians that are in accord with known empirical properties of strong interaction

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45

Muncey, Roderick John. "Polymers for photon-harvesting and solar energy conversion." Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434542.

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46

Micklewright, Benjamin. "Gravitational radiation and photon rockets." Thesis, University of York, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245960.

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47

Lindenberg, Kai. "Development and construction of the low-energy photon tagger NEPTUN." München Verl. Dr. Hut, 2007. http://d-nb.info/987775855/04.

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48

Cornish, Carrie Sjaarda. "Highly efficient photon echo generation and a study of the energy source of photon echoes /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/6031.

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49

Heaphy, Eileen Anne. "Jet photoproduction and photon structure." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252008.

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50

Jerjen, Iwan. "Superconducting tunnel junctions as energy resolving single photon detectors /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17113.

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