Dissertations / Theses on the topic 'Spin polarized electrons'
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Yokoyama, Koji. "Muon probes of spin-polarized electrons in GaAs." Diss., UC access only, 2009. http://proquest.umi.com/pqdweb?index=104&did=1907186881&SrchMode=1&sid=1&Fmt=7&retrieveGroup=0&VType=PQD&VInst=PROD&RQT=309&VName=PQD&TS=1270484411&clientId=48051.
Full textIncludes abstract. Includes bibliographical references (leaves 121-123). Issued in print and online. Available via ProQuest Digital Dissertations.
Kuwahara, M., T. Morino, T. Nakanishi, S. Okumi, M. Yamamoto, M. Miyamoto, N. Yamamoto, et al. "Spin-Polarized Electrons Extracted from GaAs Tips using Field Emission." American Institite of Physics, 2007. http://hdl.handle.net/2237/11993.
Full textLöffler, Wolfgang. "Electrical preparation of spin-polarized electrons in semiconductor quantum dots." [S.l. : s.n.], 2008. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000008367.
Full textWent, Michael Ray, and n/a. "Scattering of Spin Polarized Electrons from Heavy Atoms: Krypton and Rubidium." Griffith University. School of Science, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040220.134142.
Full textWent, Michael Ray. "Scattering of Spin Polarized Electrons from Heavy Atoms: Krypton and Rubidium." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365606.
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Hansen, Jens-Ole 1965. "A measurement of spin-dependent asymmetries in quasielastic scattering of polarized electrons from polarized helium-3." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/32634.
Full textTaborelli, Mauro. "Magnetism of epitaxial thin films and single-crystal surfaces studied with spin-polarized secondary electrons /." [S.l.] : [s.n.], 1988. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8545.
Full textNakamura, Katsuro. "Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized p+p Collisions at √s =200 GeV." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/175120.
Full textAllen, William D. "Aspects of spin polarised transport." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368082.
Full textGröbli, Jean-Claude. "Spin filter and highly polarized electron sources /." [S.l.] : [s.n.], 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11148.
Full textHatton, D. C. "Spin polarized electron scattering at ferromagnetic interfaces." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603854.
Full textSadeghzadeh, Kayvan. "Spin polarised Fermi gases." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610744.
Full textAllenspach, Rolf Allenspach Rolf Allenspach Rolf Allenspach Rolf. "Magnetic characterization at surfaces by spin polarized electron spectroscopies /." [S.l.] : [s.n.], 1985. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7952.
Full textBuckle, S. J. "Molecular field effects in electron spin polarized atomic deuterium." Thesis, University of Sussex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372071.
Full textMohamad, Haidar Jawad. "Ultrafast optical measurements of spin-polarized electron dynamics in nanostructured magnetic materials." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18425.
Full textOkumi, Shoji, Naoto Yamamoto, Kuniaki Tamagaki, Atsushi Mano, Ryosuke Sakai, Masahiro Yamamoto, Makoto Kuwahara, et al. "Development of the New Type Polarized Electron Source for SPLEEM." American Institite of Physics, 2007. http://hdl.handle.net/2237/11990.
Full textKato, Takashi, Yasuhito Ishikawa, Hiroyoshi Itoh, and Jun-ichiro Inoue. "Intrinsic anisotropic magnetoresistance in spin-polarized two-dimensional electron gas with Rashba spin-orbit interaction." American Physical Society, 2008. http://hdl.handle.net/2237/11252.
Full textPramanik, Sandipan. "Spin Polarized Transport in Nanoscale Devices." VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd/1092.
Full textBebb, Andrew M. "Synchrotron radiation studies of spin-polarised electron momentum density distributions." Thesis, University of Warwick, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404845.
Full textDjeghloul, Fatima Zohra. "Study of organic semiconductor / ferromagnet interfaces by spin-polarized electron scattering and photoemission." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01062352.
Full textPravica, Luka. "Polarised electron studies of spin-dependent interactions in zinc and krypton atoms." University of Western Australia. School of Physics, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0063.
Full textSchofield, Debra Mary. "Development of spin-polarised scanning tunnelling microscopy for the study of spin electronic materials." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442379.
Full textDörr, Kathrin. "Ferromagnetic manganites: spin-polarized conduction and competing interactions." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1193676987929-14995.
Full textLindebaum, Stephan [Verfasser], Jürgen [Akademischer Betreuer] König, and Wolfgang [Akademischer Betreuer] Belzig. "Spin-Polarized Transport in Single-Electron Spin-Valve Transistors / Stephan Lindebaum. Gutachter: Wolfgang Belzig. Betreuer: Jürgen König." Duisburg, 2012. http://d-nb.info/1036115887/34.
Full textDörr, Kathrin. "Ferromagnetic manganites: spin-polarized conduction and competing interactions." Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A23959.
Full textZhou, Haosheng. "Theory of the magnetic resonance spectrum of spin-polarized hydrogen gas." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26678.
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Allsworth, Max Daniel. "The effect of spin-polarised electrons on superconductivity in a ferromagnet superconductor bilayer." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273991.
Full textPhillips, Lee Charles. "Spintronic devices with highly spin-polarised manganite electrodes and graphene channels." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610490.
Full textHaidar, Mohammad. "Role of surfaces in magnetization dynamics and spin polarized transport : a spin wave study." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00869643.
Full textInoue, Jun-ichiro, Takashi Kato, Yasuhito Ishikawa, and Hiroyoshi Itoh. "Vertex Corrections to the Anomalous Hall Effect in Spin-Polarized Two-Dimensional Electron Gases with a Rashba Spin-Orbit Interaction." The American Physical Society, 2006. http://hdl.handle.net/2237/7131.
Full textSeemann, Klaus Michael. "Spin polarized electron transport and the anomalous Hall effect in L10-ordered epitaxial Fe-alloys." Thesis, University of Leeds, 2009. http://etheses.whiterose.ac.uk/115/.
Full textJunior, Jaime Duarte. "Método autoconsistente de primeiros princípios spin polarizado de espaço direto." Universidade de São Paulo, 1991. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-08112013-154808/.
Full textIn this work we present an approach based on the linear muffin-tin orbital (LMTO) formalism in the atomic sphere approximation (ASA) and on the recursion method which allows us to perform first principies calculations in real space. To test the method, we obtain the electronic structure of ferromagnetic FeNi3 e antiferromagnetic FeMn. The results compare well with those obtained by others methods. To illustrate the scheme applied to a non-periodic system, we calculate the electronic structure and local magnetic moments for a substitutional impurity of Fe in a Cu host. Our results for the magnetic moment and local density of states at the Fe site, agree well with KKR-Green functions and experimental results in the literature. The scheme described here is extremely flexible and is very useful to obtain local distribuition of magnetic moments in complex metallic systems.
Choi, Deung jang. "Kondo effect and detection of a spin-polarized current in a quantum point contact." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAE029/document.
Full textThe Kondo effect of these single objects represents a model system to study electron correlations, which are nowadays of importance in relation to the emerging field of spin electronics, also known as spintronics, where chemical elements with partially filled d or f shells play a central role. Also of particular interest to spintronics is the interaction of single Kondo impurities with ferromagnetic leads or with other magnetic impurities. A Kondo impurity is in fact sensitive to its magnetic environment as the ASK resonance is usually split into two resonances in the presence of magnetic interactions. To some extent, the ASK resonance acts as a two-fold degenerate energy level of an atom which undergoes a Zeeman splitting in the presence of an effective magnetic field. Conversely, the detection of a Zeeman splitting indicates the existence of a magnetic field. In a QD, the coupling of the QD to the two leads is very weak in general, and the Kondo resonance is in the range of a few meV. Many studies focusing on magnetic interaction have been carried out on QDs, due to the high control that can be extended to the ASK resonance and its low energy range, allowing to split the resonance with a magnetic field of 10 T. Similar work has also been carried out in single-molecule or lithographically-defined devices. Although STM is an ideal tool to study the Kondo effect of single atoms, there is still a strong lack of experimental studies concerning atoms in the presence of magnetic interactions. This is partly due to the stronger impurity-metal hybridization compared to QDs, which places the ASK width in the range of 10 meV. An effective magnetic field of 100 T would be needed to split the resonance. The present Thesis is devoted precisely at studying the interaction between a single Kondo impurity with its magnetic environment through STM. A new strategy is adopted herecompared to former studies of this kind. Firstly, we contact a single-magnetic atom on a surface with a STM tip thereby eliminating the vacuum barrier. Secondly, we use ferromagnetic tips. The contact with a single atom allows probing the influence of ferromagnetism on the Kondo impurity i. e. its ASK resonance. But most importantly, the contact geometry produces sufficiently high current densities compared to the tunneling regime, so that the ASK resonance becomes sensitive to the presence of a spin-polarized current. This constitutes the first atomic scale detection of a spin-polarized current with a single Kondo impurity
Bowles, Cameron Michael Albert, and cameronbowles@hotmail com. "Pushing the boundaries of condensed matter electron momentum spectroscopy." The Australian National University. Research School of Physical Sciences and Engineering, 2008. http://thesis.anu.edu.au./public/adt-ANU20080409.193948.
Full textYuan, Junhua Filippone Bradley. "Progress towards a high precision measurement of the neutron spin--electron angular correlation in polarized neutron beta decay with ultra-cold neutrons /." Diss., Pasadena, Calif. : Caltech, 2006. http://resolver.caltech.edu/CaltechETD:etd-01302006-153024.
Full textJenkins, Anne Ceri. "Applications of spin-polarised relativistic scattering theory to the calculation of the electronic properties of heavy metals and alloys." Thesis, Keele University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321408.
Full textDutta, Chiranjib. "MEASUREMENT OF SINGLE-TARGET SPIN ASYMMETRIES IN THE ELECTROPRODUCTION OF NEGATIVE PIONS IN THE SEMI-INCLUSIVE DEEP INELASTIC REACTION n↑(e,éπ¯)X ON A TRANSVERSELY POLARIZED 3He TARGET." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/29.
Full textGrenier, Philippe. "Etude des fonctions de structure en spin du nucleon : l'experience e143 au slac." Clermont-Ferrand 2, 1995. http://www.theses.fr/1995CLF21720.
Full textBombor, Dirk. "Transportmessungen an Supraleitenden Eisenpniktiden und Heusler-Verbindungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-160515.
Full textIn this work, results of electronic transport measurements are discussed for superconducting iron pnictides as well as for ferromagnetic Heusler compounds. The iron pnictides are a recently discovered class of high temperature superconductors where magnetism might play a crucial role. While the 122-pnictides show antiferromagnetism and migrate to the superconducting state upon doping, ferromagnetism has been observed in doped LiFeAs. On the other hand, in the undoped state this material shows interesting superconducting properties. Among other propierties, Heusler compounds are well known due to their ferromagnetism. Co2FeSi, which was investigated in this work, is one of the strongest ferromagnets. Beside this, one predicts this compound to be a half-metallic ferromagnet with completely spin polarized electronic transport where all conducting electrons have the same spin. The here addressed properties can well be investigated with the method of electronic transport measurements, whose results on single crystals are discussed in this work
ACHILLI, SIMONA. "Spectral properties of adsorbates on metal surfaces via the embedding method." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2010. http://hdl.handle.net/10281/10827.
Full textHasch, Delia. "Messung der polarisierten Strukturfunktion g1(x, Q 2) des Protons mit dem HERMES-Experiment." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 1999. http://dx.doi.org/10.18452/14523.
Full textThe subject of this thesis is the measurement of the polarised structure function g1p of the proton in deeply inelastic positron-proton-scattering at a centre of mass energy of 7.5 GeV. The data used in the analysis were recorded during the 1997 running period of the Hermes experiment using a longitudinally nuclear polarised hydrogen target in the 27.6 GeV Hera polarised positron storage ring. The cross section asymmetry of positron-proton-scattering has been measured by counting the number of inclusively reconstructed and selected positrons with target spin vector parallel or antiparallel to the beam spin direction. Background processes, spectrometer effects, and radiative corrections have been taken into account by applying different correction procedures. Here background corrections were determined from data while spectrometer corrections were computed from Monte Carlo simulation. The dependence of Monte Carlo and radiative corrections on the model asymmetry chosen to describe polarisation dependent effects has been minimised by applying an iterative procedure. From the fully corrected cross section asymmetry the asymmetry g1/F1 has been computed in the kinematic region 0.021 < x < 0.85 and Q2 > 0.8 GeV^2 with a systematic uncertainty of 8% and a statistical accuracy of 6% to 20%, raising for decreasing x values. The polarised structure function g1p(x,Q2), determined from the asymmetry g1/F1 , was evoluted to a common Q2_0 value assuming g1/F1 to be independent of Q2. Its first moment evaluated in the measured x region is int_{0.021}^{0.85} dx g1p(x,Q2_0) = 0.122 =- 0.003 (stat) =- 0.010 (sys) at Q2_0 = 2.5 GeV^2. This result has been compared with those from E143 at SLAC and from SMC at CERN, both calculated with the same integration scheme and for the kinematic range of Hermes. With respect to the statistical uncertainties the agreement is better than 0.6 and 1.2 standard deviations, respectively. Extrapolation over the entire x range [0,1] yield for the first moment\int_{0}^{1} dx g1p(x,Q2_0) = 0.132 +- 0.003 (stat) +- 0.010 (sys) +- 0.006 (extr) where the additional error gives the uncertainty in the extrapolation x -> 0. The interpretation of this measurement in the framework of the quark parton model taking QCD corrections of the order O(alphaS^3) into account results in a contribution of the quarks to the total nucleon spin of (30 +- 10)% at Q2_0 = 2.5 GeV^2. This result corresponds to a deviation from the Ellis-Jaffe prediction by 2.5 standard deviation regarding the given total uncertainty. Within the quark parton model the deviation can be interpreted as negative polarisation of the strange sea quarks with a contribution of (-9 +- 4)% at Q2_0 = 2.5 GeV^2. Different groups give contributions of the quarks to the nucleon spin of 19% to 44% which were obtained from QCD analyses of various data sets. The fundamental Bjorken sum rule has been determined at Q2_0 = 2.5 GeV^2 using the Hermes measurement of the polarised neutron structure function g1n. With respect to the experimental accuracy of 13 %, the result agrees within 0.5 standard deviation with the theoretical prediction taking QCD corrections of the order O(alphaS^3) into account.
Giacomoni, Laurence. "De la magnétorésistance géante à la magnétorésistance tunnel de multicouches magnétiques métalliques et métal/isolant." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10156.
Full textYan, Zeyin. "Reconstruction de densité d'impulsion et détermination de la matrice densité réduite à un électron." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC001/document.
Full textHigh resolution X-ray diffraction (XRD) and polarized neutron diffraction (PND) are commonly used to model charge and spin densities in position space. Additionally, Compton scattering (CS) and magnetic Compton scattering (MCS) are the main techniques to observe the most diffuse electrons and unpaired electrons by providing the “Directional Compton Profiles" (DCPs) and ”Directional magnetic Compton Profiles" (DMCPs), respectively. A set of such DCPs (DMCPs) can be used to reconstruct two-dimensional or three-dimensional electron momentum density. Since all these techniques describe the same electrons in different space representations, we concentrate on associating the electron momentum density reconstructed from DCPs (resp. DMCPs) with electron density refined using XRD (resp. PND) data.The confrontation between theory and experiment, or between different experiments, providing several sets of experimental data, is generally obtained from the reconstructed electron densities and compared with theoretical results in position and momentum spaces. The challenge of comparing the results obtained by ab-initio computations and experimental approaches (in the Nit(SMe)Ph case) shows the necessity of a multiple experiments joint refinement and also the improvement of theoretical computation models. It proves that, in the case of a spin resolved electron density, a mere Hartree-Fock or DFT approach is not sufficient. In the YTiO3 case, a joint analysis of position and momentum spaces (PND & MCS) highlights the possible ferromagnetic pathway along Ti--O1--Ti. Therefore, a “super-position" spin density is proposed and proves to allow cross-checking the coherence between experimental electron densities in posittion and momentum spaces, without having recourse to ab initio results. Furthermore, an ”isolated Ti model" based on PND refined orbital coefficients emphasizes the importance of metal-oxygen coherent coupling to properly account for observations in momentum space.A one-electron reduced density matrix (1-RDM) approach is proposed as a fundamental basis for systematically combining position and momentum spaces. To reconstruct 1-RDM from a periodic ab initio computation, an "iterative cluster" approach is proposed. On this basis, it becomes possible to obtain a theoretical spin resolved 1-RDM along specific chemical bonding paths. It allows a clarification of the difference between Ti--O1--Ti and Ti--O2--Ti spin couplings in YTiO3. It shows that interaction contributions between atoms (metal and oxygen atoms) are different depending on whether the property is represented in position or momentum spaces. This is clearly observed in metal-oxygen chemical bonds and can be illustrated by an orbital resolved contribution analysis. Quantities for electron descriptions in phase space, such as the Moyal function, can also be determinerd by this "cluster model", which might be of particular interest if Compton scattering in Bragg positions could be generalized. The preliminary results of a simple spin resolved 1-RDM refinement model are exposed. The model respects the N-representability and is adapted for various experimental data (e.g.: XRD, PND, CS, MCS, XMD etc.). The potential of this model is not limited to a spin analysis but its use is limited here to the unpaired electrons description. The limitations of this model are analysed and possible improvements in the future are also proposed
Jones, Cathleen Elaine. "A measurement of the spin-dependent asymmetry in quasielastic scattering of polarized electrons from polarized ^3He." Thesis, 1992. https://thesis.library.caltech.edu/6686/1/Jones_ce_1992.pdf.
Full textThe results of a measurement of the spin-dependent asymmetry in inclusive quasielastic scattering of polarized electrons from polarized ^3He are reported. The experiment was run at the MIT-Bates Linear Accelerator Center using a beam of longitudinally polarized electrons at an incident energy of 574 MeV. Scattered electrons were detected independently in two spectrometers, with one measurement sensitive to the spin-dependent transverse quasielastic response function, R_(T'), at Q^2 = 0.20 (GeV/c)^2 and the other sensitive to the spin-dependent interference response function, R(TL'), at Q^2 = 0.16 (GeV/c)^2. The asymmetry in the elastic kinematic region was also measured at a scattering angle of 44°. The target was gaseous ^3He polarized through optical pumping of metastable 2^3S atoms, with the polarization transferred to the ground state atoms through metastability exchange collisions. The target, the first of its kind to be used for an electron scattering experiment, is described in detail.
The analysis of the helicity dependent cross section data and the extraction of the quasielastic asymmetry are discussed. The measured quasielastic asymmetries are compared to theories that model the spin-dependent properties of ^3He as being dominated by the electromagnetic properties of the neutron, and are found to agree with the models. A value of the neutron electric form factor at Q^2 = 0.16 (GeV/c)^2 is extracted from the measured asymmetry sensitive to R_(TL'), demonstrating a new technique for accessing information about the neutron.
Löffler, Wolfgang [Verfasser]. "Electrical preparation of spin-polarized electrons in semiconductor quantum dots / von Wolfgang Löffler." 2008. http://d-nb.info/994895925/34.
Full textRutherford, George Henry. "An intense source of spin-polarized electrons based on an optically-pumped flowing helium afterglow." Thesis, 1989. http://hdl.handle.net/1911/13388.
Full textGuite, Chinkhanlun. "Experimental Studies Of Electron Spin Dynamics In Semiconductors Using A Novel Radio Frequency Detection Technique." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2458.
Full textGuite, Chinkhanlun. "Experimental Studies Of Electron Spin Dynamics In Semiconductors Using A Novel Radio Frequency Detection Technique." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2458.
Full textPradeep, A. V. "Development of a Spin-Polarized Low Energy Electron Diffraction System and Investigation on Spin-Orbit and Exchange Interactions on Ir(100) and Ultrathin Fe(100) Grown on Ir(100)." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3202.
Full textPradeep, A. V. "Development of a Spin-Polarized Low Energy Electron Diffraction System and Investigation on Spin-Orbit and Exchange Interactions on Ir(100) and Ultrathin Fe(100) Grown on Ir(100)." Thesis, 2016. http://hdl.handle.net/2005/3202.
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