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Dissertations / Theses on the topic 'Quantum nanostructures'

Author: Grafiati
Published: 9 March 2023
Last updated: 31 July 2025

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1

Todorov, Tchavdar N. "Quantum transport in nanostructures." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334909.

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2

Leadbeater, Mark. "Quantum dynamics of superconducting nanostructures." Thesis, Lancaster University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337369.

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3

Barbosa, Jose Camilo. "Quantum transport in semiconductor nanostructures." Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263288.

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4

Reina, Estupin̄án John-Henry. "Quantum information processing in nanostructures." Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:6375c7c4-ecf6-4e88-a0f5-ff7493393d37.

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Since information has been regarded as a physical entity, the field of quantum information theory has blossomed. This brings novel applications, such as quantum computation. This field has attracted the attention of numerous researchers with backgrounds ranging from computer science, mathematics and engineering, to the physical sciences. Thus, we now have an interdisciplinary field where great efforts are being made in order to build devices that should allow for the processing of information at a quantum level, and also in the understanding of the complex structure of some physical processes
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5

Shortell, Matthew P. "Zinc oxide quantum dot nanostructures." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/76335/4/Matthew_Shortell_Thesis.pdf.

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Zinc oxide (ZnO) is one of the most intensely studied wide band gap semiconductors due to its many desirable properties. This project established new techniques for investigating the hydrodynamic properties of ZnO nanoparticles, their assembly into useful photonic structures, and their multiphoton absorption coefficients for excitation with visible or infrared light rather than ultraviolet light. The methods developed are also applicable to a wide range of nanoparticle samples.
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6

Nemec, Norbert. "Quantum transport in carbon-based nanostructures." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985358963.

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7

Smeeton, Timothy Michael. "The nanostructures of InGaN quantum wells." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614901.

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8

Boese, Daniel. "Quantum transport through nanostructures : quantum dots, molecules, and quantum wires = Quantentransport durch Nanostrukturen /." Aachen : Shaker, 2002. http://swbplus.bsz-bw.de/bsz096321318abs.htm.

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9

Wesslén, Carl-Johan. "Many-Body effects in Semiconductor Nanostructures." Licentiate thesis, Stockholms universitet, Fysikum, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-102344.

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Low dimensional semiconductor structures are modeled using techniques from the field of many-body atomic physics. B-splines are used to create a one-particle basis, used to solve the more complex many-body problems. Details on methods such as the Configuration Interaction (CI), Many-Body Perturbation Theory (MBPT) and Coupled Cluster (CC) are discussed. Results from the CC singles and doubles method are compared to other high-precision methods for the circular harmonic oscillator quantum dot. The results show a good agreement for the energy of many-body states of up to 12 electrons. Properties
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10

Pang, Hongliang, and 庞鸿亮. "Quantum control of spins in semiconductor nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208042.

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Spins localized in semiconductor nanostructures have been intensively investigated for quantum spintronics. These include the spin of single electron localized by quantum dots or impurities, and spins of the lattice nuclei. These localized spins can be exploited as carriers of quantum information, while in some circumstances they also play the role of deleterious noise sources for other quantum objects through their couplings. Quantum control of the spins in semiconductor nanostructures is therefore of central interest for quantum applications. In this thesis, we address several problems relat
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11

Dellow, Mark Winston. "Quantum and classical transport in semiconductor nanostructures." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334765.

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12

Lee, Young-Su Ph D. Massachusetts Institute of Technology. "Electronic structure and quantum conductance of nanostructures." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37371.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2006.<br>Includes bibliographical references (p. 145-158).<br>This thesis is dedicated to development and application of a novel large-scale first-principles approach to study the electronic structure and quantum conductance of realistic nanoscale materials. Electron transport at the nanometer scale involves phenomena which are beyond the realm of classical transport theory: the wave character of the electrons becomes central, and the Schrddinger equation needs to be solved explicitly. First-pri
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13

Toft, Ian. "Fibre optic micro-photoluminescence of quantum nanostructures." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614103.

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14

Schönherr, Piet. "Growth and characterisation of quantum materials nanostructures." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:7dca792e-4236-4d19-aa59-7c9c3cb5d0e4.

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The three key areas of this thesis are crystal synthesis strategies, growth mechanisms, and new types of quantum materials nanowires. The highlights are introduction of a new catalyst (TiO2) for nanowire growth and application to Bi2Se3, Bi2Te3, SnO2, and Ge nanowires; demonstration of step-flow growth, a new growth mechanism, for Bi2Te3 sub-micron belts; and the characterisation of the first quasi-one dimensional topological insulator (orthorhombic Sb-doped Bi2Se3) and topological Dirac semimetal nanowires (Cd3As2). Research into new materials has been one of the driving forces that have cont
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15

Vezvaee, Arian. "Quantum spins in semiconductor nanostructures: Hyperfine interactions and optical control." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/104870.

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Quantum information technologies offer significantly more computational power for certain tasks and secure communication lines compared to the available classical machines. In recent years there have been numerous proposals for the implementation of quantum computers in several different systems that each come with their own advantages and challenges. This dissertation primarily focuses on challenges, specifically interactions with the environment, and applications of two of such systems: Semiconductor quantum dots and topological insulators. The first part of the dissertation is devoted to th
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16

Wen, Xiaoming, and n/a. "Ultrafast spectroscopy of semiconductor nanostructures." Swinburne University of Technology, 2007. http://adt.lib.swin.edu.au./public/adt-VSWT20070426.110438.

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Semiconductor nanostructures exhibit many remarkable electronic and optical properties. The key to designing and utilising semiconductor quantum structures is a physical understanding of the detailed excitation, transport and energy relaxation processes. Thus the nonequilibrium dynamics of semiconductor quantum structures have attracted extensive attention in recent years. Ultrafast spectroscopy has proven to be a versatile and powerful tool for investigating transient phenomena related to the relaxation and transport dynamics in semiconductors. In this thesis, we report investigations into th
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17

Smeu, Manuel. "Quantum transport modeling of atomic nanostructures on silicon." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107818.

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Surface effects can adversely influence the performance of a nanoelectronic device,but may also lead to new functionality. The focus of this thesis is to theoreticallystudy the role of surfaces in nanoelectronics. Our theoretical analysis is from atomicfirst principles achieved by combining density functional theory with the Keldyshnonequilibrium Green's function approach. This technique allows for all atoms in asystem to be treated on an equal footing without any phenomenological parameters.The first part of the thesis considers conduction through a molecule with no substrateto illustrate the
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18

Petej, Ivan. "Coulomb blockade and quantum conductance in ferromagnetic nanostructures." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270647.

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19

Gillies, Patrick R. "Path integral quantum Monte Carlo for semiconductor nanostructures." Thesis, Heriot-Watt University, 2007. http://hdl.handle.net/10399/2033.

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Path integral quantum Monte Carlo (PI-QMC) is a powerful technique, which can be used to model the properties of multiple interacting particles at finite temperatures. In this work path integral quantum Monte Carlo has been applied to the problem of few particle interactions in quantum dots and other semiconductor nanostructures. Quantum dots are currently the subject of much research and in order to further understand their properties it is necessary to perform theoretical modelling. In this work, the method by which the problem of the attractive Coulomb potential was overcome is detailed. Fo
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20

Gauger, E. M. "Applications of quantum coherence in condensed matter nanostructures." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:fb792980-bfc4-4771-b5d5-b9ecc7d40cd8.

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This thesis is concerned with studying the fascinating quantum properties of real-world nanostructures embedded in a noisy condensed matter environment. The interaction with light is used for controlling and manipulating the quantum state of the systems considered here. In some instances, laser pulses also provide a way of actively probing and controlling environmental interactions. The first two research chapters assess two different ways of performing all-optical spin qubit gates in self-assembled quantum dots. The principal conclusion is that an `adiabatic' control technique holds the promi
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21

Schaffry, Marcus C. "Creation and manipulation of quantum states in nanostructures." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:3d38fd34-041a-45be-aee0-2038d94b31ed.

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Nanostructures are promising building blocks for quantum technologies due to their reproducible nature and ability to self-assemble into complex structures. However, the need to control these nanostructures represents a key challenge. Hence, this thesis investigates the manipulation and creation of quantum states in certain nanostructures. The results of this thesis can be applied to quantum information processing and to extremely sensitive magnetic-field measurements. In the first research chapter, we propose and examine methods for entangling two (remote) nuclear spins through their mutual c
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22

Xu, Fuming, and 许富明. "Quantum transport study of mesoscopic systems and nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B4691772X.

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23

Hu, Hsiu-Lien. "Quantum transport of energetic electrons in ballistic nanostructures." Virtual Press, 2000. http://liblink.bsu.edu/uhtbin/catkey/1178341.

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The various electronic phenomena of electrons in the quasi-one-dimensional semiconducotor heterostructures have been largely investigated in the past research, due to its importance both on the theoretical understanding and the design of nanodevices. In particular, most research is currently based on the GaAs-AIGaAs material system with a 2-DEG interface. From the study of Hua Wu, following the Bohm's interpretation of quantum mechanics, energetic electrons approximately approach the classical behavior. The goal of this theoretical study is to investigate how the flow of energetic electrons ma
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24

Kumar, A. S. (Arvind S. ). "Single electron charging effects in quantum dot nanostructures." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/41328.

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25

Veyrat, Louis. "Quantum Transport Study in 3D Topological Insulators Nanostructures." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-210217.

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In this thesis, we investigate the quantum transport properties of disordered three dimensional topological insulator (3DTI) nanostructures of BiSe and BiTe in detail. Despite their intrinsic bulk conductivity, we show the possibility to study the specific transport properties of the topological surface states (TSS), either with or without quantum confinement. Importantly, we demonstrate that unusual transport properties not only come from the Dirac nature of the quasi-particles, but also from their spin texture. Without quantum confinement (wide ribbons), the transport properties of diffusiv
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26

Pegolotti, Giulia. "Quantum engineering of collective states in semiconductor nanostructures." Paris 7, 2014. http://www.theses.fr/2014PA077136.

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Ce travail de thèse est centré sur l'étude théorique de la réponse optique de gaz d'électrons denses confinés dans des puits quantiques semiconducteurs. Dans ces systèmes, les spectres d'absorption présentent des résonances optiques à des énergies complètement différentes par rapport aux transitions électroniques du puits quantique. Ces résonances correspondent à des excitations collectives, rénormalisées par l'interaction de Coulomb. La partie principale de ce travail concerne le développement d'un modèle de la réponse optique qui décrit les effets collectifs dans des systèmes des puits quant
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27

Yoshie, Tomoyuki Scherer Axel. "Planar photonic crystal nanocavities with active quantum nanostructures /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-05272004-095431.

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28

Cothrel, Helen M. "Photolithography for the Investigation of Nanostructures." Ohio University Honors Tutorial College / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1429719171.

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29

Lok, Shu Kin. "MBE grown Fe-based nanostructures /." View abstract or full-text, 2010. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202010%20LOK.

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30

Wen, Xiaoming. "Ultrafast spectroscopy of semiconductor nanostructures." Australasian Digital Thesis Program, 2007. http://adt.lib.swin.edu.au/public/adt-VSWT20070426.110438/index.html.

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Thesis (PhD) - Swinburne University of Technology, Centre for Atom Optics and Ultrafast Spectroscopy, 2007.<br>Thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy, Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, 2007. Typescript. Bibliography: p. 122-144.
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31

Racec, Paul Nicolae. "Transport phenomena and capacitance of open quantum semiconductor nanostructures." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965463613.

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32

Wickles, Christian [Verfasser]. "Quantum Transport in Non-Collinear Magnetic Nanostructures / Christian Wickles." Konstanz : Bibliothek der Universität Konstanz, 2011. http://d-nb.info/102321041X/34.

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33

Nazir, Ahsan. "Optical schemes for quantum information processing in semiconductor nanostructures." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409819.

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34

Sanvito, Stefano. "Giant magnetoresistance and quantum transport in magnetic hybrid nanostructures." Thesis, Lancaster University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484207.

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35

Iamraksa, Phansak. "Near-infrared photodetectors based on Si/SiGe quantum nanostructures." Thesis, University of Southampton, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438676.

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36

Baek, Jinyoung. "Microchemical systems for the synthesis of nanostructures : quantum dots." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76476.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 153-152).<br>We have developed a continuous multi-stage high-temperature and high-pressure microfluidic system. High-pressure conditions enabled the use low molecular weight solvents that have previously not been available for quantum dot (QD) synthesis such as hexane or octane. The use of supercritical phase provided excellent mixing, which was critical in producing high quality QDs. In addition, the microfluidic syste
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37

Foxman, Ethan Bradley 1966. "Single electron charging and quantum effects in semiconductor nanostructures." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/72770.

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38

Fruchtman, Amir. "Theory and modelling of energy transport in quantum nanostructures." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:9c00d93c-c839-4342-9dc1-c2917c71a670.

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This thesis is concerned with quantum properties of excitonic energy transport in nanostructures that are embedded in a noisy environment. Of principal interests are ways to exploit this environment to facilitate the transport of energetic excitations. The first research chapter deals with an extension to the 'standard' open quantum system picture, where the Hilbert space is split into three: system, environment, and a wider universe. This division is natural for many biological and artificial nanostructures. A new analytical method, based on a phase space representation of the density matrix,
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39

Al-Galiby, Qusiy. "Quantum theory of sensing and thermoelectricity in molecular nanostructures." Thesis, Lancaster University, 2016. http://eprints.lancs.ac.uk/80279/.

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This thesis presents a series of studies into the electronic and thermoelectric properties of molecular junction single organic molecules: They include perylene Bisimide (PBIs), naphthalenediimide (NDI), metallo-porphryins and a large set of symmetric and asymmetric molecules. Two main techniques will be included in the theoretical approach, which are Density Functional Theory, which is implemented in the SIESTA code [1], and the Green’s function formalism of elctron transport (Chapter 2), which is implemented in the GOLLUM code [2], it is a next-generation code, born out of the non-equilibriu
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40

Beyer, Jan. "Spin Properties in InAs/GaAs Quantum Dot based Nanostructures." Doctoral thesis, Linköpings universitet, Funktionella elektroniska material, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-75097.

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Semiconductor quantum dots (QDs) are a promising building block of future spin-functional devices for applications in spintronics and quantum information processing. Essential to the realization of such devices is our ability to create a desired spin orientation of charge carriers (electrons and holes), typically via injection of spin polarized carriers from other parts of the QD structures. In this thesis, the optical orientation technique has been used to characterize spin generation, relaxation and detection in self-assembled single and multi-QD structures in the InAs/GaAs system prepared b
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41

Sabathil, Matthias. "Opto-electronic and quantum transport properties of semiconductor nanostructures /." Garching : Verein zur Förderung des Walter Schottky Instituts der Technischen Universität München, 2005. http://www.loc.gov/catdir/toc/fy1002/2008380872.html.

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42

Moaied, Modjtaba. "A Generalized Non-local Quantum Theory for Plasmonic Nanostructures." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/18433.

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The propagation of light and its interaction with metallic nanostructures at the scale that is smaller than the wavelength of light (subwavelength) is an interesting phenomenon. In recent years, confining light at a subwavelength scale by very small metallic nanoparticles, such that quantum effects cannot be neglected, has generated interest in the scientific community. The light-matter interactions at this level require a careful quantum mechanical treatment to be correctly characterized, hence evolving in a new field named Quantum Plasmonics. In metallic nanostructures with sizes below 10 nm
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43

Hellström, Staffan. "Exciton-plasmon interactions in metal-semiconductor nanostructures." Doctoral thesis, KTH, Teoretisk kemi och biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93306.

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Semiconductor quantum dots and metal nanoparticles feature very strong light-matter interactions, which has led to their use in many photonic applications such as photodetectors, biosensors, components for telecommunications etc.Under illumination both structures exhibit collective electron-photon resonances, described in the frameworks of quasiparticles as exciton-polaritons for semiconductors and surface plasmon-polaritons for metals.To date these two approaches to controlling light interactions have usually been treated separately, with just a few simple attempts to consider exciton-plasmon
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44

Righetto, Marcello. "Optical Nanostructures for Excitonic Devices." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3425292.

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Unrelenting advances in the field of nanoscience are fostering the progress in diverse research fields, ranging from light-emitting to medicine and diagnostics, from energy conversion to communication technologies. Besides representing the most paradigmatic example of nanoscience, semiconductor quantum dots (QDs) avowedly brought revolutions in many of the research fields mentioned above. Nowadays, some QDs-based devices and applications reported efficiencies almost as good as current state-of-the-art technologies. The founding concept of QDs is the application of quantum confinement effects o
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45

Wang, Cheng. "Modulation dynamics of InP-based quantum dot lasers and quantum cascade lasers." Thesis, Rennes, INSA, 2015. http://www.theses.fr/2015ISAR0009/document.

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Le besoin incessant de débits toujours plus élevés dans les systèmes de télécommunications a un impact sur tous les éléments composant la chaine de transmission. Ainsi, pour faire face à l’augmentation croissante du volume de données échangées à travers le monde, le développement de nouvelles sources optiques semi-conductrices est absolument nécessaire. La modulation directe de lasers nanostructurés constitue une alternative bas coût et à faible consommation énergétique qui permettra de remplacer progressivement les diodes lasers à puits quantiques actuelles. De nombreux efforts en recherche o
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46

Tian, Heng, and 田恒. "Application of hierarchical equations of motion to time dependent quantum transport." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B47869446.

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Within the exact framework established recently, which is a successful marriage between the time dependent density functional theory for open electronic system and quantum dissipation theory formulated in the hierarchical equations of motion, an entirely new scheme is proposed in this thesis to simulate the time-dependent quantum transport in nano-devices at both zero and finite temperature equally without relying on the pole structure of the Fermi distribution function. Neither does it depend on any non-unique parametrization of the line-width matrix, hence, this new practical approac
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47

Rho, Young Gyu. "Quantum-Confined CdS Nanoparticles on DNA Templates." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc279352/.

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As electronic devices became smaller, interest in quantum-confined semiconductor nanostructures increased. Self-assembled mesoscale semiconductor structures of II-VI nanocrystals are an especially exciting subject because of their controllable band gap and unique photophysical properties. Several preparative methods to synthesize and control the sizes of the individual nanocrystallites and the electronic and optical properties have been intensively studied. Fabrication of patterned nanostructures composed of quantum-confined nanoparticles is the next step toward practical applications. We have
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48

Benhsaien, Abdessamad. "Self-assembled quantum dot semiconductor nanostructures modeling: Photonic device applications." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27225.

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A microscopic analysis of a vertical stack of self-assembled InAs/GaAs lens-shaped quantum dot nanostructures is presented. The analysis revolves around a rigorous Hamiltonian formulation of an eight-band k.p. perturbation to account for the lattice-mismatch strain endured by the islands. The numerical implementation yields the effective bandgap energy and electronic structure of an InAs/GaAs quantum dot. Within the framework of a resonant two-level energy system, material gain and absorption spectra are calculated up to a third-order susceptibility to include nonlinearity. The material gain
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49

Ngo, Anh T. "Spin-orbit Effects and Electronic Transport in Nanostructures." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1292260134.

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50

Hakanen, Jani. "Modeling of nanostructures with complex source and drain." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4285.

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<p>In this thesis we report on calculations for open quantum mechanical and certain microwave systems. The models refer to a quantum point contact and an electron cavity. We model this open system with an imaginary potential as source and drain, and use the finite difference method to make our calculations. We report on general features of the model we have found, and compare our calculations with measurements made on microwave cavities.</p>
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