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Dissertations / Theses on the topic 'Ultra fast vortex dynamics'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Persson, Milton. "Transient Dynamics and Core Tunneling in Vertical Spin-Vortex Pairs." Thesis, KTH, Nanostrukturfysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-242225.

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Spin-vortices in vertically spaced pairs of thin elliptical Permalloy nanoparticles are investigated. The two vortex cores with parallel out-of-plane magnetization exhibit a strong monopole-like attraction through the spacer much thinner than the core length, thus forming a bound core-core pair. The material of the spacer is designed to suppress both direct and indirect exchange interactions, so the remaining inter-vortex coupling is purely dipolar. In the investigated vortex pairs, the in-plane magnetization in the vortex periphery, outside the vortex cores, curl in opposite directions (have

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2

Dimian, Mihai. "Nonlinear spin dynamics and ultra-fast precessional switching." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2426.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Electrical 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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3

Zhao, Kun. "Ultra-fast dynamics of small molecules in strong fields." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3444.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Chemical Physics. 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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4

Álvarez, Sánchez Miguel. "Dynamics of an ultra-fast Thomson actuated HVDC breaker." Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209587.

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High Voltage Direct Current (HVDC) is a rapidly growing form of power transmission that offers advantages with respect to conventional AC networks. One of the key elements that will allow the generalization of the HVDC grids is the Circuit Breaker (CB), which has to interrupt high DC currents in extremely short times. The use of a Thomson coil (TC) to generate high driving forces is being considered as a suitable working principle for the mechanical actuator inside the CB. This thesis presents the design of a concept of a mechanical actuator based on the Thomson coil for SCiBreak AB, a company

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5

Gordon, R. "Investigating the ultra-fast dynamics of semiconductor lasers by optical pulse injection techniques." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599528.

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Resonant injection of sub-picosecond optical pulses were explored as an ultra-fast analogue to injection locking, to influence the phase of the semiconductor laser on short time-scales. This allowed for efficiently altering the absolute phase of the lasing modes (without exciting new modes to lase) and produced mode interference beating; both demonstrated in vertical cavity surface emitting lasers (VCSELs). The ultra-fast optical sampling was extended to resolve polarization degrees of freedom, showing the nonlinear coupling between transverse modes through the charge carriers. Phase-sensitive

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6

Rey, Pereira Héctor Francisco. "Ultra-fast dynamics in multi-electron systems using time-dependent R-matrix theory." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.696164.

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The central topic of this thesis is the application of the R-matrix with time dependence (RMT) approach to describe the interaction of intense ultra-short laser pulses with general multi-electron atomic systems (specifically helium and carbon). The physical phenomena investigated in this thesis include above-threshold ionization, multiphoton ionization and inner-shell ionization. The RMT codes were first employed to investigate angular distributions of photoelectrons in two-colour two-photon above threshold ionization of helium as a testing ground for the codes. The calculated angular anisotro

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7

Lee, Jonghee. "Low temperature scanning tunneling microscope development: investigations of Au(111) and ultra-slow vortex dynamics of NbSe2." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7767.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Dept. of Physics. 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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8

Cörlin, Philipp [Verfasser], and Robert [Akademischer Betreuer] Moshammer. "Tracing ultra-fast molecular dynamics in O_2^+ and N_2^+ with XUV–IR pump–probe experiments / Philipp Cörlin ; Betreuer: Robert Moshammer." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180502361/34.

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9

Le, Marchand Tanguy. "Protein Dynamics by Solid-State NMR with Ultra-Fast Magic-Angle Spinning : from Microcrystals to Amyloid Fibrils and Membrane Proteins." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEN023/document.

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La Résonance Magnétique Nucléaire (RMN) à l’état solide avec rotation à l’angle magique (MAS) est une technique de choix pour l’étude de la structure et de la dynamique de molécules biologiques peu ou non solubles. Un grand nombre d’approches ont été développées pour la reconstitution de structures tridimensionelles à partir de mesures précises de proximités internucléaires, ainsi que pour la détection de mouvements moléculaires avec une résolution atomique sur des échelles de temps couvrant plusieurs ordres de grandeur. Malgré d’impressionnants progrès, les études par RMN MAS sont cependant l

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10

Radue, Elizabeth Lee. "Study of Variations of the Dynamics of the Metal-Insulator Transition of Thin Films of Vanadium Dioxide with An Ultra-Fast Laser." W&M ScholarWorks, 2016. https://scholarworks.wm.edu/etd/1477068473.

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Vanadium dioxide is an intensely studied material, since it goes through an insulator-metal transition at a critical temperature just above room temperature at 340~K. The dramatic change in conductivity and the easily accessible transition temperature makes it an attractive material for novel technologies. Thin films of VO2 have a reversible transition without any significant degradation in contrast, and depending on the microstructure of the films, the properties of the transition are tunable. In this work, I study the dynamics of the insulator-transition in thin films grown on different subs

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11

Lee, Min-I. "Atomic structure, electronic states and relaxation dynamics in photovoltaic materials and interfaces from photoemission-related spectroscopies." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS220/document.

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L'efficacité du processus photovoltaïque dépend du matériau actif à travers la structure de bande et la dynamique des porteurs de charge. Dans cette thèse, nous avons relié les propriétés électroniques et la dynamique de relaxation à la structure atomique des matériaux utilisés pour deux technologies différentes de cellules solaires, celle à base d’hétérostructures de silicium, et celle à base de pérovskites hybrides organiques-inorganiques. Dans les cellules solaires de silicium, nous avons analysé l'influence des défauts sur les propriétés électroniques des hétérostructures de silicium amorp

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12

Alves, Carla. "Studying ultrafast magnetization dynamics through Faraday effect and using linearly polarized high order harmonics." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS328.

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Dans cette thèse, nous démontrons qu’un rayonnement harmonique XUV polarisé linéairement peut être utilisé en spectroscopie d’absorption pour accéder à l’état de magnétisation de tout type d’échantillon, contrairement à toutes les techniques développées jusque-là. En effet, pour la première fois, des expériences résolues en temps ont été réalisées par l'effet Faraday magnéto-optique, que nous exploitons autour du seuil d'absorption magnétiquement dichroïque M2,3 du Cobalt à 60 eV. La technique pompe-sonde a été utilisée pour obtenir la réponse dynamique des échantillons magnétiques lors de l'e

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13

McCormick, Elizabeth Joan McCormick. "Optical Properties of Two Dimensional Semiconductors." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531907387651019.

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14

Mancal, Tomas. "Laser pulse control of dissipative dynamics in molecular systems." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2002. http://dx.doi.org/10.18452/14895.

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Diese Arbeit wird einer Weiterentwicklung der Dichtematrixtheorie und ihrer Anwendung zum Studium ultraschneller laserpulsinduzierter Dynamik in Molekularsystemen in Wechselwirkung mit einem thermischen Bad gewidmet. Zwei grosse Themenkomplexe werden behandelt. Zuerst werden die sogenannten Gedächtniseffekte diskutiert. Diese folgen aus einer reduzierten Beschreibung des Molekularsystems, in der die Umgebungsfreiheitsgrade eliminiert werden. Im zweiten Teil wird die Laserpulssteuerung der dissipativen Molekulardynamik untersucht. Die theoretische Beschreibung von offenen Quantensystemen führt

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15

Cho, Byoung-ick 1976. "Experimental study of fast electrons from the interaction of ultra intense laser and solid density plasmas." 2008. http://hdl.handle.net/2152/17808.

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A series of experiments have been performed to understand fast electron generation from ultra intense laser-solid interaction, and their transports through a cold material. Using Micro-Electro-Mechanical Systems (MEMS), we contrived various shape of cone and wedge targets. The first set of experiment was for investigating hot electron generations by measuring x-ray production in different energy ranges. K[alpha] and hard x-ray yields were compared when the laser was focused into pyramidal shaped cone targets and wedge shaped targets. Hot electron production is highest in the wedge targets irra

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16

Ahmed, Ghada H. "Tracking Ultrafast Charge Carrier Dynamics at the Interface of Semiconductor Nanocrystals." Diss., 2020. http://hdl.handle.net/10754/661839.

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Abstract: Understanding and controlling the ultrafast charge carrier and exciton dynamics at the interface of semiconductor nanocrystals (NCs) offer an excellent opportunity to improve the charge collection and the overall performance of many optoelectronic and energy-based devices. In this dissertation, we study how interfacial engineering of these materials can have a direct influence on controlling the charge transfer and the nonradiative losses in different donor-acceptor systems. The first introductory chapter provides an overview of all the fundamental photophysical processes contr

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17

Hsu, Po-Jen, and 許伯任. "Molecular dynamics simulations of a fragment of the protein transthyretin and metallic clusters diagnosed by the ultra-fast shape recognition technique, time series segmentation, time series cross correlation analysis and diffusion theory method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/86679394498611521552.

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博士<br>國立中央大學<br>物理學系<br>102<br>Part I--An ultrafast shape-recognition technique was used to analyze the phase transition of finite-size clusters, which, according to our research, has not yet been accomplished. The shape of clusters is the unique property that distinguishes clusters from bulk systems, and is comprehensive and natural for structural analysis. In this study, an isothermal molecular dynamics simulation was performed to generate a structural database for shape recognition of Ag-Cu metallic clusters using empirical many-body potential. The probability contour of the shape similarit

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18

Jarvis, Thomas William. "Novel tools for ultrafast spectroscopy." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4456.

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Exciton dynamics in semiconductor nanostructures are dominated by the effects of many-body physics. The application of coherent spectroscopic tools, such as two-dimensional Fourier transform spectroscopy (2dFTS), to the study of these systems can reveal signatures of these effects, and in combination with sophisticated theoretical modeling, can lead to more complete understanding of the behaviour of these systems. 2dFTS has previously been applied to the study of GaAs quantum well samples. In this thesis, we outline a precis of the technique before describing our own experiments using 2dFTS

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