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Dissertations / Theses on the topic 'Superlattices'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Deans, Mark Edward. "Phonons in superlattices." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254406.

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2

Hadizad, M. Reza. "Lattice dynamics of superlattices." Thesis, University of Essex, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292758.

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3

Rajakarunanayake, 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.

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4

Müggenburg, 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.

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5

Evans, S. D. "Langmuir-Blodgett superlattices incorporating porphyrins." Thesis, Lancaster University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235169.

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6

Pulsford, Nicolas J. "Optical studies of semicondutor superlattices." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257905.

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7

Chen, Peixuan. "Thermal transport through SiGe superlattices." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159170.

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Understanding thermal transport in nanoscale is important for developing nanostructured thermolelectric materials and for heat management in nanoelectronic devices. This dissertation is devoted to understand thermal transport through SiGe based superlattices. First, we systematically studied the cross-plane thermal conductivity of SiGe superlattices by varying the thickness of Si(Ge) spacers thickness. The observed additive character of thermal resistance of the SiGe nanodot/planar layers allows us to engineer the thermal conductivity by varying the interface distance down to ~1.5 nm. Si-Ge in

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8

Chen, Peixuan. "Thermal transport through SiGe superlattices." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20177.

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Understanding thermal transport in nanoscale is important for developing nanostructured thermolelectric materials and for heat management in nanoelectronic devices. This dissertation is devoted to understand thermal transport through SiGe based superlattices. First, we systematically studied the cross-plane thermal conductivity of SiGe superlattices by varying the thickness of Si(Ge) spacers thickness. The observed additive character of thermal resistance of the SiGe nanodot/planar layers allows us to engineer the thermal conductivity by varying the interface distance down to ~1.5 nm. Si-Ge in

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9

BELL, JOHN A. "BRILLOUIN SCATTERING FROM METAL SUPERLATTICES." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184045.

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Acoustic modes guided by thin-film metal superlattices have been investigated using Brillouin spectroscopy. Samples were grown on both single-crystal sapphire and fused silica substrates by alternately sputtering two different metals to yield a total thickness in the range 0.3 - 0.5 μm. Structural and chemical characterization of the polycrystalline films was performed using x-ray diffraction. Rutherford backscattering and optical interferometry. Thermally excited acoustic waves in the metal film create a surface ripple which weakly interacts with light incident from a single mode argon laser.

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10

Boufelfel, Ahmed. "Iron-based magnetic metallic superlattices." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184340.

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For the first time we prepared and investigated the structural, magnetic, and electrical transport properties of Fe/W, Fe/Mo, and Fe/Pd metallic superlattices. We made a theoretical attempt to explain the induced increase or decrease of the magnetization at the magnetic superlattice interfaces. We used several x-ray diffraction techniques to determine the structural properties of our superlattices. Mossbauer spectroscopy and neutron scattering were used to determine the induced microscopic magnetic effects due to the superlattice structure. Brillouin scattering spectroscopy was used to determi

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11

Zirngibl, Martin. "High speed photodetectors on strained superlattices /." [S.l.] : [s.n.], 1990. http://library.epfl.ch/theses/?nr=854.

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12

Deacon, Russell. "Magnetotransport studies of InAs/GaSb superlattices." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427872.

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13

Beardsley, Ryan. "Coherent phonon processes in semiconductor superlattices." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546547.

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14

Turton, 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.

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15

Adderley, 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.

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16

Wong, 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.

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17

Hosseini-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.

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18

Liu, Yong. "Phonons in heterojunctions and semiconductor superlattices." Thesis, University of Exeter, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335015.

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19

Raj, N. "Dielectric and magnetic properties of superlattices." Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381931.

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20

Constantinou, N. C. "Theory of plasmon-polaritions in superlattices." Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381926.

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21

Wilkins, 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.

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22

Huang, Wujie. "Spin-obit coupling in optical superlattices." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/103235.

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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 173-176).<br>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 ef

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23

Huesmann, Hannah [Verfasser]. "Artificial Nanoparticle-Polymer Superlattices / Hannah Huesmann." Mainz : Universitätsbibliothek der Johannes Gutenberg-Universität Mainz, 2021. http://d-nb.info/1229616853/34.

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24

Matharu, Satpal. "Charge dynamics in coupled semiconductor superlattices." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17158.

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In this thesis, we investigate the collective electron dynamics in single and coupled superlattice systems under the influence of a DC electric field. Firstly, we illustrate that Bloch oscillations suppress electron transport and the resulting charge domains form self-sustained current oscillations. Upon the application of a tilted magnetic field, stochastic web structures are shown to form in the phase space of the electron trajectory. This occurs only when the Bloch and cyclotron frequencies are commensurate allowing the electrons to demonstrate chaotic unbounded trajectories, leading to an

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25

Hugi, Johannes. "Ultrafast MSM photodetectors on InGaAs/GaAs superlattices /." [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1229.

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26

Rieder, Bernhard. "Semiclassical transport in semiconductor superlattices with boundaries." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972880070.

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27

Zheng, Liqiu. "Spin density wave phases in semiconductor superlattices." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202500635/.

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28

P'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.

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29

Sarthour, 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.

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30

Warnatz, 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.

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31

Milton, 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.

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32

White, 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.

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33

Gilbert, Timothy George. "Electronic states of ultrathin GaAs/AlAs superlattices." Thesis, University of Leicester, 1988. http://hdl.handle.net/2381/35893.

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The continuing refinement of crystal growth techniques has made possible the fabrication of semiconductor superlattices where the period can be as small as one lattice constant. Prediction of many of the properties of such systems requires a detailed description of their electronic structure. In this thesis, a self-consistent pseudopotential method which includes a parametrization scheme has been used to calculate the electronic properties of (GaAs)n(AlAs)n superlattices with n ranging from 1 to 4. The parametrization scheme is used to reproduce energy gaps at the principal symmetry points for

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34

Ferre, Llin Lourdes. "Thermoelectric properties on Ge/Si1−xGex superlattices." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/4861/.

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Thermoelectric generation has been found to be a potential field which can be exploited in a wide range of applications. Presently the highest performances at room temperature have been using telluride-based devices, but these tech- nologies are not compatible with MEMs and CMOS processing. In this work Silicon and Germanium 2D superlattices have been studied using micro fabri- cated devices, which have been designed specifically to complete the thermal and electrical characterization of the different structures. Suspended 6-contact Hall bars with integrated heaters, thermometers and ohmic con

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35

Santos, Peter J. (Peter Jeffries). "Self-assembling nanocomposite Tectons for ordered superlattices." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127907.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, May, 2020<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 260-280).<br>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.

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36

Apostolakis, Apostolos. "High-frequency acoustoelectronic phenomena in miniband superlattices." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/25277.

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The motion of a quantum particle in a periodic potential can generate rich dynamics in the presence of a driving field. Such systems include, but are not limited to, semiconductor superlattices which exhibit a very anisotropic band structure that results into pronounced nonlinearities and high carrier mobility. In this thesis, we investigate the semiclassical dynamics and electron transport in a spatially periodic potential driven by a propagating wave. Firstly, we examine the transport features of an electron in a single miniband superlattice driven by a high-frequency acoustic plane wave. In

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37

Maher, Christopher andrew. "NMR study of paramagnetic nano-checkerboard superlattices." W&M ScholarWorks, 2012. https://scholarworks.wm.edu/etd/1539623592.

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With the ubiquity of electronic devices, finding ways to improve quality or fabrication methods of components is an important area of study. This dissertation looks at two sets of materials that may be used to address this need. The first is a series of disordered perovskites of the form Nd&frac23;xLi3 xTiO3. These materials are notable for the way the lithium becomes spontaneously patterned during synthesis into square planar regions, the dimensions of which are only dependent upon the initial concentration of lithium. Through the use of point-charge calculations, the paramagnetic and first-o

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38

Leung, 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.

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39

Tank, 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.

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40

Fyath, 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.

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This thesis is concerned with a detailed study of the performance of superlattice avalanche photodiodes (SAPDs) and the implications for high bit rate direct-detection optical fibre communication systems. In these advanced detectors the electron to hole ionisation rate ratio is artificially enhanced through selective heating of the electron distribution to reduce the excess noise associated with the randomness of the avalanche multiplication and to ensure high gain-bandwidth product. Thus SAPDs are suitable for long wavelength applications (1.3-1.6 pm) where most compound semiconductor materia

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41

Blair, 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.

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The refraction properties of photonic crystal lattices offers methods to control the beam steering of light through use of non-linear dispersion contours. In this thesis new photonic crystal structures, such as the square and triangular superlattices, that provide novel refractive properties are analyzed. The property difference between rows in these structures is the hole radius Δr. The difference in hole sizes leads to observation of the superlattice effect, that is, a change in the refractive index Δn between opposite rows of holes. The index difference becomes a function of the size of

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42

Amann, Andreas. "Nonlinear and chaotic front dynamics in semiconductor superlattices." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970075081.

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43

Sun, 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.

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44

Broddefalk, 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.

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<p>Magnetic 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 <i>ab initio</i> calculations. </p><p>The magnetic compounds (Fe<sub>1-x</sub>M<sub>x</sub>)<sub>3</sub>P, M=Co or Mn have been studied extensively. It was found that Co can substitute Fe up to <i>x</i>=0.37. Increasing the Co content leads to a reduction of the Curie temperature and the magnetic moment p

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45

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.

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46

Warburton, 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.

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47

Jehan, 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.

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48

Simpson, 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.

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49

Springett, 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.

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50

Hughes, D. T. "Electronic states in semiconductor superlattices and quantum wells." Thesis, Durham University, 1989. http://etheses.dur.ac.uk/6519/.

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The aim of this thesis is two-fold. Firstly to show how a complex bandstructure matching technique has been developed which allows detailed investigations to be made of various low dimensional structures. Secondly the method will be used to investigate interesting physical properties of quantum wells and superlattices. Consequently the thesis will begin with an exposition of the matching technique, giving an indication of the numerical methods used for computational calculations. Evidence will then be given, in the form of a comparison between the present work and the experimental and theoreti

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