Tesi sul tema "Superlattices"
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Deans, Mark Edward. "Phonons in superlattices". Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254406.
Testo completoHadizad, M. Reza. "Lattice dynamics of superlattices". Thesis, University of Essex, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292758.
Testo completoRajakarunanayake, Yasantha Nirmal McGill T. C. McGill T. C. "Optical properties of Si-Ge superlattices and wide band gap II-VI superlattices /". Diss., Pasadena, Calif. : California Institute of Technology, 1991. http://resolver.caltech.edu/CaltechETD:etd-07122007-074702.
Testo completoMüggenburg, Jan. "Ion beam analysis of metallic vanadium superlattices : Ion beam analysis of metallic vanadium superlattices". Thesis, Uppsala universitet, Tillämpad kärnfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-328067.
Testo completoEvans, S. D. "Langmuir-Blodgett superlattices incorporating porphyrins". Thesis, Lancaster University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235169.
Testo completoPulsford, Nicolas J. "Optical studies of semicondutor superlattices". Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257905.
Testo completoChen, Peixuan. "Thermal transport through SiGe superlattices". Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159170.
Testo completoVerständnis des thermischen Transport auf Nanoskala ist sowohl grundlegend für die Entwicklung nanostrukturierter Materialien, als auch für Temperaturkontrolle in nanoelektronischen Bauteilen. Diese Dissertation widmet sich der Erforschung des thermischen Transports durch SiGe basierenden Übergittern. Variationen, der Si(Ge) Schichtdicken, wurden zur systematischen Untersuchung der Normalkomponente zur Wachstumsrichtung der Wärmeleitfähigkeit, von SiGe Übergittern, genutzt. Die Beobachtung des additiven Charakters, des thermischen Widerstands, der SiGe Schichten, mit oder ohne Inselwachstum, ermöglicht die Erstellung von Strukturen mit bestimmter Wärmeleitfähigkeiten durch die Variation der Schichtdicken bis zu einer Minimaldistanz zweier Schichtübergänge von ~1.5nm. Die Ge Segregation führt zu einer Vermischung, von Si und Ge, welche eine essentielle Rolle zur diffusen Phononenstreuung spielt. Unsere Untersuchungen, von planaren Übergittern und Übergittern mit variabler Inseldichte, zeigen, dass Inseln und planare Schichten zu einer vergleichbaren Reduktion, der Wärmeleitfähigkeit, führen. Diese Beobachtung lässt sich, sowohl auf die flache Morphologie als auch die Abplattung der SiGe Inseln, aufgrund der Überwachsung mit Si, zurückführen. Die Experimente zeigen außerdem, dass sich der Barriereneffekt, der Schichtgrenzen, durch Reduktion der Schichtabstände und durch verstärkte Vermischung im Bereich der Schichtgrenzen, durch Erhitzung, eliminieren lässt. Die präsentierten Messungen sind sowohl, für die Entwicklung jener Bauteile, die eine Optimierung des thermischen Transports oder Temperaturmanagment erfordern, als auch von thermoelektrischen Matieralien und Bauteilen, basierend auf Übergittern, relevant
Chen, Peixuan. "Thermal transport through SiGe superlattices". Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20177.
Testo completoVerständnis des thermischen Transport auf Nanoskala ist sowohl grundlegend für die Entwicklung nanostrukturierter Materialien, als auch für Temperaturkontrolle in nanoelektronischen Bauteilen. Diese Dissertation widmet sich der Erforschung des thermischen Transports durch SiGe basierenden Übergittern. Variationen, der Si(Ge) Schichtdicken, wurden zur systematischen Untersuchung der Normalkomponente zur Wachstumsrichtung der Wärmeleitfähigkeit, von SiGe Übergittern, genutzt. Die Beobachtung des additiven Charakters, des thermischen Widerstands, der SiGe Schichten, mit oder ohne Inselwachstum, ermöglicht die Erstellung von Strukturen mit bestimmter Wärmeleitfähigkeiten durch die Variation der Schichtdicken bis zu einer Minimaldistanz zweier Schichtübergänge von ~1.5nm. Die Ge Segregation führt zu einer Vermischung, von Si und Ge, welche eine essentielle Rolle zur diffusen Phononenstreuung spielt. Unsere Untersuchungen, von planaren Übergittern und Übergittern mit variabler Inseldichte, zeigen, dass Inseln und planare Schichten zu einer vergleichbaren Reduktion, der Wärmeleitfähigkeit, führen. Diese Beobachtung lässt sich, sowohl auf die flache Morphologie als auch die Abplattung der SiGe Inseln, aufgrund der Überwachsung mit Si, zurückführen. Die Experimente zeigen außerdem, dass sich der Barriereneffekt, der Schichtgrenzen, durch Reduktion der Schichtabstände und durch verstärkte Vermischung im Bereich der Schichtgrenzen, durch Erhitzung, eliminieren lässt. Die präsentierten Messungen sind sowohl, für die Entwicklung jener Bauteile, die eine Optimierung des thermischen Transports oder Temperaturmanagment erfordern, als auch von thermoelektrischen Matieralien und Bauteilen, basierend auf Übergittern, relevant.
BELL, JOHN A. "BRILLOUIN SCATTERING FROM METAL SUPERLATTICES". Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184045.
Testo completoBoufelfel, Ahmed. "Iron-based magnetic metallic superlattices". Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184340.
Testo completoZirngibl, Martin. "High speed photodetectors on strained superlattices /". [S.l.] : [s.n.], 1990. http://library.epfl.ch/theses/?nr=854.
Testo completoDeacon, Russell. "Magnetotransport studies of InAs/GaSb superlattices". Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427872.
Testo completoBeardsley, Ryan. "Coherent phonon processes in semiconductor superlattices". Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546547.
Testo completoTurton, Richard John. "Optical spectra of silicon - germanium superlattices". Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264483.
Testo completoAdderley, B. M. "Nonlinear optical properties of semiconductor superlattices". Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239137.
Testo completoWong, K. B. "Electronic properties of GaAs-GaAlAs superlattices". Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356158.
Testo completoHosseini-Khorasgani, Sayed-Ali. "Third harmonic generation in semiconductor superlattices". Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318603.
Testo completoLiu, Yong. "Phonons in heterojunctions and semiconductor superlattices". Thesis, University of Exeter, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335015.
Testo completoRaj, N. "Dielectric and magnetic properties of superlattices". Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381931.
Testo completoConstantinou, N. C. "Theory of plasmon-polaritions in superlattices". Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381926.
Testo completoWilkins, Caroline Jane Theresa. "Magnetic properties of rare earth superlattices". Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368119.
Testo completoHuang, Wujie. "Spin-obit coupling in optical superlattices". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/103235.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 173-176).
Quantum simulation is emerging as an exciting and active frontier in atomic physics. It allows us not only to verify existing models with high precision, but also to engineer novel systems with strong correlations and exotic topologies. Recent efforts have been made to include synthetic gauge fields and spin-orbit couplings into ultracold quantum gas experiments, which would enable us to study the quantum Hall effect, topological insulators as well as topological superfluids. This thesis will describe the experimental implementation of a new spin-orbit coupled system using pseudospin-1/2 in an optical superlattices, as well as progress towards detecting the stripe phase in this system. The first part of this thesis describes the development of a new apparatus for performing quantum simulations with sodium and lithium in optical lattices. A quantum simulation program is challenging itself, therefore having a stable platform for preparing quantum gases is essential for this task. We'll describe our development in reliable and efficient production of sodium Bose-Einstein condensates and lithium degenerate Fermi gases, as well as the characterization of our optical lattice system in a superfluid to a Mott-insulator quantum phase transition. The dynamics of a Bloch oscillation in a tilted lattice has also been studied as an important step towards the implementation of synthetic magnetic fields in our system. The second part of this thesis describes the experimental realization of spin-orbit coupling in a pseudospin-1/2 system using an optical superlattice. This new scheme uses orbital states in a tilted double-well as the pseudospins, therefore does not require near-resonant Raman light to flip the spins and promise longer lifetimes compared to earlier spin-orbit coupling experiments in atomic gases. It also features a robust miscible ground state with stationary density stripes, which is closely related to the concept of supersolidity in condensed matter systems. We'll present our experimental implementation of this new system, signatures of the resonant spin-orbit coupling, as well as progress toward experimental detection of the stripe phase via Bragg scattering. This pseudospin-1/2 system could also be used for simulating quantum magnetism,and potentially novel models with topological properties and Majorana excitations.
by Wujie Huang.
Ph. D.
Huesmann, Hannah [Verfasser]. "Artificial Nanoparticle-Polymer Superlattices / Hannah Huesmann". Mainz : Universitätsbibliothek der Johannes Gutenberg-Universität Mainz, 2021. http://d-nb.info/1229616853/34.
Testo completoMatharu, Satpal. "Charge dynamics in coupled semiconductor superlattices". Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17158.
Testo completoHugi, Johannes. "Ultrafast MSM photodetectors on InGaAs/GaAs superlattices /". [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1229.
Testo completoRieder, Bernhard. "Semiclassical transport in semiconductor superlattices with boundaries". [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972880070.
Testo completoZheng, Liqiu. "Spin density wave phases in semiconductor superlattices". Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202500635/.
Testo completoP'ng, M. Y. "Strength and deformation of coherently strained superlattices". Thesis, Queen Mary, University of London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413463.
Testo completoSarthour, Roberto S. "Magnetism in rare-earth superlattices and alloys". Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312552.
Testo completoWarnatz, Tobias. "Synthesis and Characterization of Fe/MgO Superlattices". Thesis, Uppsala universitet, Materialfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-247094.
Testo completoMilton, Brian E. "Lateral surface superlattices in strained InGaAs layers". Thesis, University of Glasgow, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340295.
Testo completoWhite, Julian Darryn. "Phonons in (Si)_m/(Ge)_n superlattices". Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239759.
Testo completoGilbert, Timothy George. "Electronic states of ultrathin GaAs/AlAs superlattices". Thesis, University of Leicester, 1988. http://hdl.handle.net/2381/35893.
Testo completoFerre, Llin Lourdes. "Thermoelectric properties on Ge/Si1−xGex superlattices". Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/4861/.
Testo completoSantos, Peter J. (Peter Jeffries). "Self-assembling nanocomposite Tectons for ordered superlattices". Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127907.
Testo completoCataloged from the official PDF of thesis.
Includes bibliographical references (pages 260-280).
Nanocomposites, materials of heterogeneous composition with at least one of the phases having dimensions between 1-100 nm, can be produced with unique properties dependent on their composition and geometric configuration. However, it is a major challenge to precisely and simultaneously design the structure of synthetic nanocomposites at the nanoscale, microscale, and macroscale. To create advanced nanocomposites in which both structure and composition can be programmed across these disparate size regimes, we have developed a new nanoparticle-based building block, the Nanocomposite Tecton (NCT). An NCT consists of an inorganic nanoparticle core and a polymeric shell, with each chain terminating in a supramolecular binding group at the periphery of the NCT.
As each NCT contains both an inorganic nanoparticle and a polymer phase, each building block is itself a nanocomposite, and the incorporation of supramolecular binding groups allows for the directed assembly of NCTs that contain complementary binding groups. These reversible supramolecular interactions enable the assembly of NCTs into ordered arrays, and the collective behavior of the binding groups can be regulated by the dynamics of the polymer chains. The NCTs are capable of rapidly self-assembling into several different crystalline phases that are determined by the design of the building block, and are resilient against dispersity in the molecular weight of the polymer brush and the diameter of the nanoparticle cores. NCTs have been synthesized with both gold and iron oxide nanoparticle cores, indicating the ability to produce NCTs at reasonable scales.
Moreover, the incorporation of multiple nanoparticle compositions allows for the synthesis of NCT-based materials with plasmonic and magnetic properties that can affect, as well as be affected by, the assembly process. We further demonstrate that the crystallization kinetics can be modulated to induce the assembly of NCTs into faceted crystallites with micron-sized diameters, and the resulting NCT crystallites can be post-processed into bulk solids with arbitrary macroscopic shape and controlled grain size. The NCT design concept is therefore a highly modular and versatile building block capable of fabricating materials with controlled structures at the levels of atomic composition and molecular geometry, nanoscale organization, microstructure, and macroscopic form.
by Peter J. Santos.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Materials Science and Engineering
Apostolakis, Apostolos. "High-frequency acoustoelectronic phenomena in miniband superlattices". Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/25277.
Testo completoMaher, Christopher andrew. "NMR study of paramagnetic nano-checkerboard superlattices". W&M ScholarWorks, 2012. https://scholarworks.wm.edu/etd/1539623592.
Testo completoLeung, H. T. "The incommensurate phases in intermediate plagioclase feldspars". Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360914.
Testo completoTank, Rashmi Winfried. "A theoretical study of semiconductor nanometer structures". Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240473.
Testo completoFyath, Raad Sami. "Advanced avalanche photodiode receivers in optical communications". Thesis, Bangor University, 1990. https://research.bangor.ac.uk/portal/en/theses/advanced-avalanche-photodiode-receivers-in-optical-communications(7774537f-4772-4a52-b216-d04db73b3781).html.
Testo completoBlair, John L. "Optical properties of the square superlattice photonic crystal structure and optical invisibility cloaking". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37112.
Testo completoAmann, Andreas. "Nonlinear and chaotic front dynamics in semiconductor superlattices". [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970075081.
Testo completoSun, Zhouzhou. "Self-sustained current oscillations in weakly coupled superlattices /". View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202005%20SUN.
Testo completoBroddefalk, Arvid. "Magnetic properties of transition metal compounds and superlattices". Doctoral thesis, Uppsala University, Department of Materials Science, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-535.
Testo completoMagnetic properties of selected compounds and superlattices have been experimentally studied using SQUID (superconducting quantum interference device) and VSM (vibrating sample magnetometer) magnetometry, neutron diffraction and Mössbauer spectroscopy measurements combined with theoretical ab initio calculations.
The magnetic compounds (Fe1-xMx)3P, M=Co or Mn have been studied extensively. It was found that Co can substitute Fe up to x=0.37. Increasing the Co content leads to a reduction of the Curie temperature and the magnetic moment per metal atom. Mn can substitute Fe up to x=0.25 while Fe can be substituted into Mn3P to 1-x=0.33. On the iron rich side, the drop in Curie temperature and magnetic moment when increasing the Mn content is more rapid than for Co substitution. On the manganese rich side an antiferromagnetic arrangement with small magnetic moments was found.
The interlayer exchange coupling and the magnetocrystalline anisotropy energy of Fe/V superlattices were studied. The coupling strength was found to vary with the thickness of the iron layers. To describe the in-plane four-fold anisotropy, the inclusion of surface terms proved necessary.
The in-plane four fold anisotropy was also studied in a series of Fe/Co superlattices, where the thickness of the Co layers was kept thin so that the bcc structure could be stabilized. Only for samples with a large amount of iron, the easy axis was found to be [100]. The easy axis of bulk bcc Co was therefor suggested to be [111].
Yip, Sui Yu. "Electronic properties of superlattices and the RKKY interaction". Thesis, Lancaster University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315466.
Testo completoWarburton, Richard John. "High magnetic field studies of strained layer superlattices". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293428.
Testo completoJehan, David Antony. "Magnetic structures in rare earth metals and superlattices". Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357569.
Testo completoSimpson, John Andrew. "Magnetic properties of rare-earth elements and superlattices". Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308539.
Testo completoSpringett, Roger James. "Raman scattering studies of III-V semiconductor superlattices". Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260178.
Testo completoHughes, D. T. "Electronic states in semiconductor superlattices and quantum wells". Thesis, Durham University, 1989. http://etheses.dur.ac.uk/6519/.
Testo completo