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Dissertations / Theses on the topic 'Electronic transitions'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Ng, Yuk-wai, and 吳育煒. "Electronic transitions of transition metal monoborides." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/195989.

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2

Wang, Na, and 王娜. "Electronic transitions of transition metal monoboride and monoxides." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208620.

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3

Qasim, Ilyas. "Structural and Electronic Phase Transitions in Mixed Transition Metal Perovskite Oxides." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10029.

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The reported multiferroic perovskite series Sr1-xAxTi1/2Mn1/2O3 has been the subject of numerous structural studies, without reaching consensus. In the current work, the cubic Pm3 ̅m is confirmed for end member SrTi1/2Mn1/2O3 in the Sr1-xAxTi1/2Mn1/2O3 ( A= Ca, La; 0 ≤ x ≤ 1) series. The Pm3 ̅m  I4/mcm  Pbnm structural evolution was observed with increased doping level of Ca. A cubic Pm3 ̅m  rhombohedral R3 ̅c transition occurred when La is substituted instead of Ca. Interesting magnetic behaviours were observed and the major contribution to this was concluded to be the mixed Mn4+/M

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4

Guarnaccia, Giuseppe. "Phase transitions in strongly correlated electronic systems." Doctoral thesis, Universita degli studi di Salerno, 2014. http://hdl.handle.net/10556/1844.

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2012 - 2013<br>We studied the some type of phase transitions in Strongly Correlated Electronic Systems. In particular we rigorously established some exact properties of a multi-orbital Hubbard model, here formulated to describe a nematic phase transition. In the first step, using Bogoliubov’s inequality, we rigorously showed that the multiorbital Hubbard model with narrow bands, eventually in the presence of the spin-orbit coupling, does not exhibit long-range nematic order, in the low dimensions. This result holds at any finite temperature for both repulsive and attractive on-site Coul

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5

Pooke, Donald Mark. "Electronic transport and dimensionality transitions in Si MOS structures." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278395.

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6

Sankari, A. (Anna). "Relativistic atomic structure calculations applied to electronic transitions in atoms." Doctoral thesis, University of Oulu, 2008. http://urn.fi/urn:isbn:9789514287282.

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Abstract In this thesis, the electronic structure of selected atoms was investigated by means of electron and uorescence spectroscopy. Synchrotron radiation was used to excitate atoms in gas phase. In particular, the photoionization and subsequent Auger decay processes in metal vapours were studied as well as the resonant Auger decay in rare gases. The experimental results were analyzed together with theoretical predictions obtained utilizing the multiconfiguration Dirac-Fock method.

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7

Beaton, Sara Armstrong. "High resolution electronic spectroscopy of NcN and CaOCHâ†3 free radicals." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364147.

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8

Muthaiah, Janani. "Optimal detection of stochastic state transitions in rechargeable sensor system." Thesis, Wichita State University, 2011. http://hdl.handle.net/10057/3964.

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Wireless sensors are often deployed in remote areas to monitor and detect interesting events. For long-term monitoring of these events, it is necessary for sensors to have perpetual operation. Hence, they are equipped with batteries that recharge using renewable resources. The work in this thesis considered the problem of detecting changes in the state of event process (referred to as state transitions) so that the number of redundant transmissions is reduced. The objective was to maximize the number of transitions detected and transmitted under energy constraints. Two types of transitions wer

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9

Jackson, A. "Synthesis and properties of materials for use in ferroelectric opto-electronic display devices." Thesis, University of Hull, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232908.

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10

Cannon, Caleb C. "Numerical evaluation of fourth-order many-body corrections to transition amplitudes for principal transitions in alkali-metal atoms /." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1440934.

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Thesis (M.S.)--University of Nevada, Reno, 2006.<br>"December, 2006." Includes bibliographical references (leaves 45-46). Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2006]. 1 microfilm reel ; 35 mm.

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11

Rai, Vidisha. "An ab initio study of electronic states and transitions of tellurium monohalides." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968337449.

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12

Piterou, Athina. "A network perspective on sociotechnical transitions : the emergence of the electronic book." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/4165.

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The sociotechnical system of print-on-paper for the dissemination of textual information prevails despite widespread concerns about its sustainability. On the basis of sociotechnical transitions theory the print-on-paper system is perceived as a regime. Information technology is identified as one of the generic technologies that has the potential to address the unsustainability of the incumbent regime. Its potential effects are examined through the development of the electronic book, which is defined as those IT applications providing an alternative form of textual display to printed paper. Ye

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13

Pandey, Saurabh <1987&gt. "Photoinduced electronic transitions and leakage correlation to defects/dislocations in GaN heterostructures." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5190/1/Pandey_Saurabh_Tesi.pdf.

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III-nitride materials are very promising for high speed electronics/optical applications but still suffer in performance due to problems during high quality epitaxial growth, evolution of dislocation and defects, less understanding of fundamental physics of materials/processing of devices etc. This thesis mainly focus on GaN based heterostructures to understand the metal-semiconductor interface properties, 2DE(H)G influence on electrical and optical properties, and deep level states in GaN and InAlN, InGaN materials. The detailed electrical characterizations have been employed on Schottky d

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14

Pandey, Saurabh <1987&gt. "Photoinduced electronic transitions and leakage correlation to defects/dislocations in GaN heterostructures." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5190/.

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III-nitride materials are very promising for high speed electronics/optical applications but still suffer in performance due to problems during high quality epitaxial growth, evolution of dislocation and defects, less understanding of fundamental physics of materials/processing of devices etc. This thesis mainly focus on GaN based heterostructures to understand the metal-semiconductor interface properties, 2DE(H)G influence on electrical and optical properties, and deep level states in GaN and InAlN, InGaN materials. The detailed electrical characterizations have been employed on Schottky d

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15

Shi, Jingming. "Ab initio prediction of crystalline phases and their electronic properties : from ambient to extreme pressures." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1110/document.

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Dans cette thèse nous utilisons des méthodes globaux de prédiction des structures cristallographiques combinés à des techniques de grande capacité de traitement de données afin de prédire la structure cristalline de différents systèmes et dans des conditions thermodynamiques variées. Nous avons réalisé des prédictions structurales utilisant l'analyse cristalline par optimisation par essaims particuliers (CALYPSO) combinés avec la Théorie Fonctionnel de la Densité (DFT) ce qui a permis de mettre en évidence la stabilité de plusieurs composés jusqu'à la inconnus dans le digramme de phases du sys

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16

Campanini, Donato. "Nanocalorimetry of electronic phase transitions in systems with unconventional superconductivity and magnetic ordering." Licentiate thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-116202.

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In this thesis, low temperature specific heat measurements on small (μg) single crystals of different superconducting and magnetic systems are presented. The device used in this work features a combination of high sensitivity and good accuracy over the temperature range 1-400 K and allows measurements in high magnetic fields. It consists of a stack of thin films deposited in the center of a Si3N4 membrane. A batch process for the production of up to 48 calorimeters from a 2" silicon wafer was developed in order to overcome the scarcity of devices and allow systematic investigations. With abund

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17

Heath, Jennifer Theresa. "Electronic transitions in the bandgap of copper indium gallium diselenide polycrystalline thin films /." view abstract or download file of text, 2002. http://wwwlib.umi.com/cr/uoregon/fullcit?p3072587.

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Thesis (Ph. D.)--University of Oregon, 2002.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 143-148). Also available for download via the World Wide Web; free to University of Oregon users.

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18

UGENTI, SIMONA. "Electronic correlations: an insight by new models for Auger and Coster-Kronig transitions." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2009. http://hdl.handle.net/2108/858.

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Le correlazioni elettroniche hanno sempre svolto un ruolo fondamentale nella Fisica ed in particolare nel campo della materia condensata. Come esempio per quest'ultimo caso basta pensare al condiviso ma non ancora compreso ruolo chiave svolto dalle correlazioni elettroniche nella superconduttività sia da nanotubi di carbonio che da composti di CuO2. A tal fine la nota caratteristica di essere una sonda locale di correlazioni elettroniche definisce la spettroscopia Auger come lo strumento più adatto per estrarre questo genere di informazioni dagli spettri misurati. In particolare gli spet

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19

Hullah, Daniel Fearnley. "The electronic spectra of FeH and TeOâ†2." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301915.

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20

Coles, Richard A. "Theory of the electronic states of semiconductor heterostructures." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4495/.

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This thesis is concerned with theoretical calculations of the properties of electronic bound states in semiconductor heterostructures. The complex band structure empirical pseudopotential method (EPM) is used as the foundation of the work. Spin orbit coupling and strain effects (due to lattice mismatch) are included in familiar ways, as is the transfer matrix method, allowing the study of arbitrarily configured heterostructures. These techniques are used to investigate the unusually deep InAs/AlSb conduction band well. The strong possibility of intraband transitions at electro magnetic wavelen

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21

Durandurdu, Murat. "Polyamorphism in Semiconductors." Ohio University / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1040060243.

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22

Cui, Wenwen. "Ab initio investigation of structural and electronic properties on 1D and 2D nanomaterials." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1111/document.

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Le sujet principal de cette thèse est l'utilisation de la Théorie Fonctionnelle de la Densité dans sa variante à liaisons fortes (DFTB) pour l'étude de l'effet de la pression sur des nanotubes de carbone. Nous commençons par étudier l'effondrement radial sous l'effet de la pression de nanotubes de carbone (CNTs) individualisés, soit dans leur forme originale (vides), soit remplis avec des molécules d'eau ou de dioxyde de carbone. Nous étudions à continuation le processus d'effondrement radial de fagots de nanotubes de carbone a faible nombre de parois (double ou triple-parois) en fonction de l

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23

Campbell, Nancy, and University of Lethbridge School of Health Sciences. "Transitions in death : the lived experience of critical care nurses." Thesis, Lethbridge, Alta. : University of Lethbridge, School of Health Sciences, 2008, 2008. http://hdl.handle.net/10133/653.

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Critical care nurses often face the ordeal of witnessing a patient's death in a tense and stressful environment. Anecdotal stories shared among nurses reveal that unusual experiences often occur at the time of or after a patient's death. This hermeneutic phenomenological study explored the meaning of these experiences for critical care nurses. Using Parse's research method, in-depth interviews were conducted with six critical care nurses who described their experiences at the time of a patient's death as well as during the post-death period. These experiences brought a sense of peace and comfo

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24

List, Nanna Holmgaard. "Theoretical Description of Electronic Transitions in Large Molecular Systems in the Optical and X-Ray Regions." Doctoral thesis, Department of Physics, Chemistry and Biology, University of Southern Denmark, Denmark, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-201156.

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The size and conformational complexity of proteins and other large systems represent major challenges for today's methods of quantum chemistry.This thesis is centered around the development of new computational tools to gain molecular-level insight into electronic transitions in such systems. To meet this challenge, we focus on the polarizable embedding (PE) model, which takes advantage of the fact that many electronic transitions are localized to a smaller part of the entire system.This motivates a partitioning of the large system into two regions that are treated at different levels of theor

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25

Liu, Lipeng. "Physics of Electrical Discharge Transitions in Air." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-205401.

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Electrical discharges with a variety of different forms (streamers, glow corona, leaders, etc.) broadly exist in nature and in industrial applications. Under certain conditions, one electrical discharge can be transformed into another form. This thesis is aimed to develop and use numerical simulation models in order to provide a better physical understanding of two of such transitions, namely the glow-to-streamer and the streamer-to-leader transitions in air. In the first part, the thesis includes the two-dimensional simulation of the glow-to-streamer transition under a fast changing backgroun

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26

Whitaker, Sabrina A. R. A. "The Possibility of Lithophile Elements in Earth's Core: The High Pressure Electronic Transitions of Rubidium and Potassium." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243539591.

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27

Mishra, Snigdharaj K. "Mean-field and density-functional studies of charge ordering and magnetic transitions in lanthanum manganites /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9841176.

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28

Smith, Phillip E. "Atomic diffusion and interface electronic structure of III-V heterojunctions and their dependence on epitaxial growth transitions and annealing." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1177957344.

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29

Rang, Knut. "A study of the stereochemistry and electronic transitions of cyclic and acyclic thioamdes by crystallography, spectroscopy and computational methods." Lund : Lund University, 1998. http://catalog.hathitrust.org/api/volumes/oclc/40265658.html.

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30

Rouzhaji, Tuerhong. "Effect of environment on the electronic and magnetic properties of transition metals and rare-earth complexes." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE006/document.

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Cette thèse présente les résultats de mesures expérimentales effectués à basse température par les techniques de microscopie tunnel à balayage et de spectroscopie par tunnel à balayage (STS) sur les métaux de transitions phthalocyanines déposées sur les surfaces de métaux nobles. Les mesures STM/STS ont été effectuées pour les molécules MnPc et CuPc adsorbées sur les surfaces Ag (111) et Au (111) à la température expérimentale de travail de 4,5 K. Ces deux types de molécules présentent une différence substantielle de configurations d'adsorption, des comportements électroniques et magnétiques e

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31

Woollacott, Claire. "Electronic and plasmonic properties of real and artificial Dirac materials." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18227.

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Inspired by graphene, I investigate the properties of several different real and artificial Dirac materials. Firstly, I consider a two-dimensional honeycomb lattice of metallic nanoparticles, each supporting localised surface plasmons, and study the quantum properties of the collective plasmons resulting from the near field dipolar interaction between the nanoparticles. I analytically investigate the dispersion, the effective Hamiltonian and the eigenstates of the collective plasmons for an arbitrary orientation of the individual dipole moments. When the polarisation points close to normal to

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32

Crawford, H., and Jean Croce Hemphill. "Bridging the Gap in Care Transitions by Implementing an Electronic Homeless Resource Toolkit for Case Management Personnel: Hospital to Community." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etsu-works/7574.

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33

Jha, Thakur Amitayush. "Relationship between the electronic structure and the functional properties of new quantum materials." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP136.

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Cette thèse explore des matériaux novateurs dont les propriétés sont intrinsèquement liées à leur structure électronique. Nous nous concentrons sur l'étude expérimentale de trois matériaux. Premièrement, le CuRhO₂ dopé au Mg, qui présente une valeur élevée du coefficient thermoélectrique en raison de sa structure électronique unique. Deuxièmement, des films minces du métal corrélé CaVO₃, qui subissent une transition métal-isolant (MIT) en dessous d'une épaisseur critique. Enfin, une hétérostructure de dihalogénure de métal de transition magnétique 2D, FeCl₂, déposée sur une surface Au(111), av

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34

Kaneko, Ulisses Ferreira 1984. "Phase transitions and electronic fluctuations in iron-based pnictides = Transições de fase e flutuações eletrônicas em pnictídeos à base de ferro." [s.n.], 2017. http://repositorio.unicamp.br/jspui/handle/REPOSIP/322478.

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Orientador: Eduardo Granado Monteiro da Silva<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-09-01T17:31:34Z (GMT). No. of bitstreams: 1 Kaneko_UlissesFerreira_D.pdf: 51229533 bytes, checksum: 3d39a6722771458fa1812d75c31661b4 (MD5) Previous issue date: 2017<br>Resumo: Nesta tese, empregamos espectroscopia Raman para realizar um estudo detalhado dos fônons e das respostas eletrônicas em monocristais de LaFeAsO. Nós observamos as simetrias e frequências dos fônons nas fases tetragonal e ortorrômbica e também a depe

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35

Weber, Frank. "Probing electronic phase transitions with phonons via inelastic neutron scattering : superconductivity in borocarbides, charge and magnetic order in manganites$nElektronische Ressource /." [S.l. : s.n.], 2007. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000007516.

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36

Chandrasekhar, Janani. "Signal to power coupling and noise induced jitter in differential signaling." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24778.

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Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Swaminathan Madhavan; Committee Member: Chatterjee Abhijit; Committee Member: Davis Jeffrey.

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37

Pentlehner, Dominik [Verfasser], and Alkwin [Akademischer Betreuer] Slenczka. "Perturbations of electronic transitions of organic molecules in helium droplets generated with a new pulsed droplet source / Dominik Pentlehner. Betreuer: Alkwin Slenczka." Regensburg : Universitätsbibliothek Regensburg, 2010. http://d-nb.info/1022872168/34.

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38

Kasic, Alexander [Verfasser]. "Phonons, free-carrier properties, and electronic interband transitions of binary, ternary, and quaternary group-III nitride layers measured by spectroscopic ellipsometry / Alexander Kasic." Aachen : Shaker, 2003. http://d-nb.info/117054195X/34.

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39

Gourgout, Adrien. "Instabilités de surface de Fermi avec et sans transitions magnétiques : étude de URhGe, UPd2AI3, UCoGe et CeIrIn5." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY001/document.

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Dans cette thèse, j'ai étudié l'évolution de la surface de Fermi sous l'influence d'un champ magnétique dans des systèmes massifs facilement polarisables à basse température. La première partie est dévouée aux cas du supraconducteur ferromagnétique UCoGe et du supraconducteur paramagnétique CeIrIn5, où la surface de Fermi peut être modifiée sans transition magnétique. Dans UCoGe, plusieurs anomalies successives ont été détectées dans l'effet Seebeck, la résistivité et l'effet Hall, sans transition nette dans l'aimantation. L'observation d'oscillations quantiques montre que ces anomalies sont r

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40

Saroka, Vasil. "Theory of optical and THz transitions in carbon nanotubes, graphene nanoribbons and flat nanoclusters." Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/28863.

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This thesis is devoted to the optical properties of low-dimensional structures based on such two-dimensional materials as graphene, silicene and phosphorene. We investigate optical properties of a variety of quasi-one dimensional and quasi-zero-dimensional structures, which are promising for future optoelectronics. Primarily we focus on their low-energy optical properties and how these properties are influenced by the structures’ geometry, external fields, intrinsic strain and edge disorder. As a consequence of this endeavor, we find several interesting effects such as correlation between the

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41

Abushammala, Haneen. "Tuning the multiorbital Mott transition of BaCoS2." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS100.

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Dans cette thèse nous ajustons la phase d’isolant de Mott du BaCoS2, un modèle multiorbital pour l’étude des corrélations électroniques. Nous avons développer une nouvelle technique de self-flux afin de produire des cristaux de qualité et de taille supérieures. Puis nous avons confirmé une phase stable orthorhombique Cmma à l’ambiante où la distorsion orthorhombique est concomitante à l’établissement d’un ordre AFM de longue portée. Ensuite, nous avons exploré la possibilité d’induire un état métallique dans du BaCoS2 via pression chimique et dopage électronique comme paramètres de contrôle. P

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42

Rajagopal, Subramanian. "Transition of low-volume complex electronic system industries to lead-free electronics." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/116.

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Thesis (M.S.) -- University of Maryland, College Park, 2003<br>Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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43

Shcheblanov, Nikita. "Numerical study of femtosecond laser interactions with dielectric materials : application to the definition of damage threshold of optical components." Thesis, Saint-Etienne, 2013. http://www.theses.fr/2013STET4029/document.

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Avec l'apparition de nouveaux systèmes laser ultra-courts, des intensités laser extrêmement élevées sont devenues accessibles, permettant ainsi un traitement au laser de pratiquement tous les matériaux. En conséquence, les techniques de traitement extrêmement précises sont en cours de développement étendant considérablement le nombre des applications industrielles et médicales correspondantes. Des progrès dans ce domaine nécessitent une meilleure compréhension des processus fondamentaux impliqués dans les interactions laser. De plus le succès à l’international du développement et de l’utilisat

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44

Cox, Simon G. "Hyperfine and Zeeman measurements in the infrared spectrum of doubly charged molecule D'3'5 C1'2'+." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366641.

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45

Kemp, Jeremy. "Electron spectroscopy and electronic structure of first row transition metal oxides." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257736.

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46

Arapan, Sergiu. "Understanding Physical Reality via Virtual Experiments." Doctoral thesis, Uppsala universitet, Institutionen för fysik och materialvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9314.

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In this thesis I have studied some problems of condensed matter at high pressures and temperatures by means of numerical simulations based on Density Functional Theory (DFT). The stability of MgCO3 and CaCO3 carbonates at the Earth's mantle conditions may play an important role in the global carbon cycle through the subduction of the oceanic crust. By performing ab initio electronic structure calculations, we observed a new high-pressure phase transition within the Pmcn structure of CaCO3. This transformation is characterized by the change of the sp-hybridization state of carbon atom and indic

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47

Haupt, Kerstin Anna. "Phase transitions in transition metal dichalcogenides studied by femtosecond electron diffraction." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85608.

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Thesis (PhD)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Low-dimensional materials are known to undergo phase transitions to differently or- dered states, when cooled to lower temperatures. These phases often show a periodic modulation of the charge density (called a charge density wave – CDW) coupled with a periodic perturbation of the crystal lattice (called a periodic lattice distortion – PLD). Although many experiments have been performed and much has been learnt about CDW phases in low-dimensional materials, the reasons for their existence are still not fully understood yet

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Philoxene, Loic. "Une nouvelle approche pour la détermination des fonctionnalités statiques et dynamiques des systèmes d'électrons fortement corrélés." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC219.

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Dans ce manuscrit, une instance particulière de représentation en bosons esclaves, introduite pour la première fois par Kotliar et Ruckenstein dans le context du modèle de Hubbard, est utilisée dans le but d’analyser les effets des interactions électroniques sur deux classes distinctes de propriétés de systèmes décrits par des modèles de Hubbard étendus.Dans un premier temps, une extension originale du modèle de Hubbard est introduite. Elle tient compte d’un potentiel à une particule modulé dans l’espace, ainsi que d’interactions entre électrons occupant des sites plus proches voisins. Ses pro

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KOUACOU, ABAKA MICHEL. "Apparition du ferromagnetisme itinerant dans des composes de type heusler. Relation avec des transitions isolant-metal." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10087.

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L'etude des proprietes magnetiques et de transport de differentes series de solutions solides autour des alliages d'heusler tico#2sn et demi-heusler ticosn montre des caracteristiques classiques du ferromagnetisme itinerant. Dans la serie tico#2sn-tini#2sn, la densite locale est fortement reduite et le critere de stoner n'est plus maintenu pour tini#2sn. Le ferromagnetisme disparait au profit d'un etat paramagnetique de pauli. Vers la limite magnetique-non magnetique, la resistivite et la chaleur specifique montrent de fortes fluctuations de spin. Dans la serie tico#xsn avec 1<x<2, ou le cobal

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Bouba, Oumarou. "Théories quantique et semi-classique des intégrales radiales de transitions dipolaires et multipolaires des états excités : Applications au calcul des forces d'oscillateur et des probabilités de transition dans l'approximation à une configuration." Orléans, 1986. http://www.theses.fr/1986ORLE0010.

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Calcul des intégrales radiales à l'approximation quasi classique (JWKB) des fonctions d'onde radiales, complétée par une description en termes de trajectoires elliptiques de l'électron optique. Obtention d'expressions analytiques de ces intégrales dont on simplifie le calcul à l'aide d'une méthode basée sur le développement limite d'une fonction bien adaptée à des calculs par interpolation ou extrapolation : elles s'expriment toutes en termes de deux fonctions fondamentales qui ne dépendent que de la différence entre deux nombres quantiques principaux effectifs des états initial et final. Dédu

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