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Dissertations / Theses on the topic 'Graphene superlattice'

Author: Grafiati
Published: 28 May 2022
Last updated: 31 July 2025

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1

Kryuchkov, S. V., E. I. Kukhar, and O. S. Nikitina. "Electromagnetic Radiation Influence on the Transversal Conductivity of the Graphene Superlattice." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35360.

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The transversal conductivity of the graphene superlattice under electromagnetic radiation and constant electric field applied along the superlattice axis was calculated. The cases of sinusoidal and cnoidal electromagnetic waves are considered. Conductivity dependences on the electromagnetic wave amplitude and on the longitudinal electric field intensity were investigated. Such dependences were shown to have the character of oscillations. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35360
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2

Kukhar, E. I., and S. V. Kryuchkov. "Constant Electric Field Influence on the Rectification of the Transversal Current Induced by the Sinusoidal and Cnoidal Electromagnetic Waves in Graphene Superlattice." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35443.

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In graphene superlattice the direct current induced in perpendicular direction with relation to the superlattice axis by cnoidal and sinusoidal electromagnetic waves under the presence of longitudinal constant electric field was calculated. Direct current dependences on the cnoidal wave amplitude and on the longitudinal electric field intensity were investigated. Direct current dependence on the cnoidal wave amplitude was shown to have resonant character. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35443
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3

Dakers, Paul A. "Superlattice electrodynamics as a source of Terahertz radiation." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10228.

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Charge-carriers propagating in superlattices exhibit the related phenomena known as negative differential conductivity and Bloch oscillation. This behaviour may be utilised for the generation of tunable electromagnetic radiation. In this work, the dependence of the drift velocity and displacement of charge-carriers on external, applied electric fields is investigated. The theory is extended to incorporate a different miniband structure, with the aim of modelling a superlattice made from graphene. I predict that, for a chosen set of electric field parameters, a semiconductor superlattice will e
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4

Benasutti, Patrick B. "Electronic and Structural Properties of Silicene and Graphene Layered Structures." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1348192958.

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5

Huber, Robin Tobias [Verfasser], and Jonathan [Akademischer Betreuer] Eroms. "Superlattice Band Structure Engineering of Graphene / Robin Tobias Huber ; Betreuer: Jonathan Eroms." Regensburg : Universitätsbibliothek Regensburg, 2021. http://d-nb.info/1237105838/34.

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6

Kryuchkov, S. V., V. I. Konchenkov, and D. V. Zavyalov. "The Appearance of Transverse Current in the Graphene Superlattice under the Influence of Elliptically Polarized Wave." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35423.

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It is explored the direct current which appears in superlattice on the base of graphene in transverse direction to the axis of this structure under the condition of constant electric field and elliptically polarized electromagnetic wave normally incident in the surface of the sample. The current dependence on constant electric field intensity has some peculiarities which has a nature closed to Stark resonance. The effect of direct current appearance is connected with energy spectrum non-additivity of graphene superlattice. When you are citing the document, use the following link http://ess
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7

Woods, Colin. "Investigations into the interfacial interaction of graphene with hexagonal boron nitride." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/investigations-into-the-interfacial-interaction-of-graphene-with-hexagonal-boron-nitride(de99f43b-790f-4a32-b696-060ed700a5bd).html.

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This thesis, submitted to the University of Manchester, covers a range of topics related to current research in two-dimensional materials under the title: 'Investigations into the interfacial interaction of graphene with hexagonal boron nitride.'In the last decade, two-dimensional materials have become a rich source of original research and potential applications. The main advantage lies in the ability to produce novel composite structures, so-called 'layered heterostructures', which are only a few atomic layers thick. One can utilise the unique properties of several species of crystal separat
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8

Kassem, Wassim. "Direct molecular dynamics simulation of piezoelectric and piezothermal couplings in crystals." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0043/document.

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La thèse est axée sur l'examen de l'effet de la contrainte sur la conductivité thermique des matériaux piézoélectriques. Les matériaux piézoélectriques sont des cristaux qui présentent une déformation mécanique lors de l'application d'un champ électrique. Des exemples de tels systèmes sont ZnO, AlN, et SiO2. En utilisant des simulations de dynamique moléculaire, nous avons calculé la conductivité thermique de cristaux de ZnO et AlN sous contrainte. Nous avons aussi calculé la résistance thermique des interfaces SiO/C et ZnO/C soumis à un champ électrique.Nous commençons par le calcul des propr
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9

Ahmed, Adam Saied. "Skyrmions and Novel Spin Textures in FeGe Thin Films and Artificial B20 Heterostructures." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492686407034025.

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10

Sanchez-Yamagishi, Javier Daniel. "Superlattices and quantum spin Hall states in graphene and hexagonal boron nitride heterostructures." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99289.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 159-178).<br>Two-dimensional (2d) layered materials, such as graphene and hexagonal boron nitride (hBN), can be isolated separately and then stacked together to form heterostructures with crystalline interfaces between the layers. In this thesis, I present a series of experiments which explore the quantum transport of electrons in heterostructures made from graphene and hBN. Depending on the relative alignment, or "twist", be
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11

Tiwari, Rakesh P. "Topics in the theory of excitations in granular matter." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259970038.

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12

Graf, Davy. "Electrons in reduced dimensions : from finite lateral superlattices in AlGaAs heterostructures to few-layer graphene /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17241.

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13

Yu, Geliang. "Transport properties of graphene based van der Waals heterostructures." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/transport-properties-of-graphene-based-van-der-waals-heterostructures(5cbb782f-4d49-42da-a05e-15b26606e263).html.

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In the past few years, led by graphene, a large variety of two dimensional (2D) materials have been discovered to exhibit astonishing properties. By assembling 2D materials with different designs, we are able to construct novel artificial van der Waals (vdW) heterostructures to explore new fundamental physics and potential applications for future technology. This thesis describes several novel vdW heterostructures and their fundamental properties. At the beginning, the basic properties of some 2D materials and assembled vdW heterostructures are introduced, together with the fabrication procedu
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14

Franchina, Vergel Nathali Alexandra. "Dirac antidot superlattices for electrons in III-V semiconductors." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1I002.

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Le graphène est l'un des matériaux les plus fascinants jamais découverts. L’observation de cette monocouche d’atomes de carbone en 2004, a suscité beaucoup d'enthousiasme dans la communauté de la physique. Il représente en fait la première réalisation d'un matériau bidimensionnel naturel. De plus, l'organisation unique des atomes de carbone lui confère des propriétés électroniques exotiques au graphène. Ainsi, la découverte du graphène a ouvert la porte à des effets quantiques difficiles à observer dans d'autres systèmes conventionnels. Néanmoins, étant un matériau naturel, la feuille de carbo
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15

Will, Moritz [Verfasser], Thomas [Gutachter] Michely, and Alec [Gutachter] Wodtke. "Cluster Superlattices on Hexagonal Boron Nitride and Graphene/Ir(111) and Their Embedding with Carbon / Moritz Will ; Gutachter: Thomas Michely, Alec Wodtke." Köln : Universitäts- und Stadtbibliothek Köln, 2021. http://d-nb.info/1233783122/34.

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16

Kumar, Chandan. "Quantum transport in Graphene Moire Superlattice and p-n junction." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5428.

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The discovery of graphene has revolutionized the field of mesoscopic condensed matter physics. It has started a new field of van-der Waals heterostructure in which different two-dimensional materials including graphene can be stacked on top of each other. In the last few years graphene based van-der Walls heterostructure has lead to many interesting physics like Hofstadter’s butterfly, Valley Hall effect, Mott insulator and superconductivity. In this thesis, two different kinds of graphene heterostructures, namely, graphene moiré superlattice (GMSL) and graphene p-n junction (GPNJ) have been s
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17

Forsythe, Carlos. "Fractal Hofstadter Band Structure in Patterned Dielectric Superlattice Graphene Systems." Thesis, 2017. https://doi.org/10.7916/D8HT31ST.

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The development and characterization of lithographically patterned dielectric superlattice systems are presented, which have enabled the first clear realization of fully developed fractal mini-gaps owing to the interplay between a quantizing magnetic field and a lithographically defined spatial superlattice potential. Following a history of lateral superlattice gating on 2-D electron gas systems, we present patterned dielectric superlattice graphene systems of unmatched quality, allowing for the characterization of Hofstadter fractal band structure under triangular and square lattice geometrie
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18

"Quantum Nonlinear Dynamics in Graphene, Optomechanical, and Semiconductor Superlattice Systems." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.40365.

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abstract: Conductance fluctuations associated with quantum transport through quantumdot systems are currently understood to depend on the nature of the corresponding classical dynamics, i.e., integrable or chaotic. There are a couple of interesting phenomena about conductance fluctuation and quantum tunneling related to geometrical shapes of graphene systems. Firstly, in graphene quantum-dot systems, when a magnetic field is present, as the Fermi energy or the magnetic flux is varied, both regular oscillations and random fluctuations in the conductance can occur, with alternating transitions b
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19

Chen, Hsuan-Yu, and 陳宣佑. "The Device Performances of InAs/GaSb Superlattice Photodetectors and the Application of Graphene for Transparent Electrodes in the Infrared Range." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/17500973452934505325.

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碩士<br>國立臺灣海洋大學<br>光電科學研究所<br>104<br>In this thesis, a series of investigation of optoelectronic characteristic is carried out through changes of structure based on 30-periods Type II InAs/GaSb superlattice infrared photodetectors. The changes of superlattice structure affect the optoelectronic characteristic of the detector. In order to expand the cut-off wavelength, the thickness of InAs was increased from 5 to 10 MLs. The responsivity shows that the cut-off wavelength was expanded from 4.2 m to 6.3 m. But at the same time, the resposivity value was dropped from 13.03 to 0.279 mA/W. In orde
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20

Nádvorník, Lukáš. "Elektronická struktura materiálů na bázi grafenu." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-313787.

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In last two years, the proposal to create artificial graphene in standard semiconducting 2D systems via surface patterning has emerged. This way, an alternative system would be created, allowing us to study phenomena related to Dirac-type particles in a fully carbon free system. The main idea of the concept assumes the creation of an additional potential in a quantum well by nanopatterning of the specimen surface or by using local electrodes. The additionally introduced modulation can transform the conventional (i.e. parabolic) energy dispersion into separated minibands with possible appearanc
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21

Lu, Chun-Chieh, and 呂俊頡. "Self-Aligned Flexible Graphene Field-Effect Transistors and Twisting Bilayer Graphene Superlattices." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/03150612355096458376.

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博士<br>國立清華大學<br>電子工程研究所<br>102<br>Graphene, a single atomic layer of graphite comprising a planar two-dimensional hexagonal lattice of carbon atoms, is the building block for graphitic materials of all other dimensionalities. Based on the Mermin-Wagner Theorem, two-dimensional crystals were thermodynamically unstable and could not exist in ambient environment.The atomic monolayer materials have so far been known only as an integral part of larger three-dimensional structures. In 2004, A. K. Geim and K. S. Novoselov et al. provided a possible method to isolate two-dimensional single atomic carb
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22

Li, Yutao. "Electronic and plasmonic band structure engineering of graphene using superlattices." Thesis, 2021. https://doi.org/10.7916/d8-rme8-9e85.

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Patterning graphene with a spatially periodic potential provides a powerful means to modify its electronic properties. In particular, in twisted bilayers, coupling to the resulting moiré superlattice yields an isolated flat band that hosts correlated many-body phases. However, both the symmetry and strength of the effective moiré potential are constrained by the constituent crystals, limiting its tunability. Here, we have exploited the technique of dielectric patterning⁶ to subject graphene to a one-dimensional electrostatic superlattice (SL). We observed the emergence of multiple Dirac cones
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23

Rodrigues, Manuel Jose Torres. "Simulating the Propagation of Electron Waves in Graphene Superlattices: A Parallel Heterogeneous Approach." Master's thesis, 2015. http://hdl.handle.net/10316/40373.

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