Auswahl der wissenschaftlichen Literatur zum Thema „Composés semiconducteurs – Propriétés magnétiques – Propriétés optiques“
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Dissertationen zum Thema "Composés semiconducteurs – Propriétés magnétiques – Propriétés optiques":
Hamdani, Fayçal. „Etude magnétooptique des semiconducteurs semimagnétiques à base de cobalt II1-xCoxVI : Cd1-xCoxSe, Cd1-xCoxS et Zn1-xCoxSe“. Montpellier 2, 1992. http://www.theses.fr/1992MON20101.
Paganotto, Nelly. „Spectroscopie sous champ magnétique d'hétérostructures CdTe/Cd1-xMnxTe à puits quantiques étroits“. Montpellier 2, 1997. http://www.theses.fr/1997MON20077.
NEGRE, NICOLAS. „Magneto-optique et forts champs magnetiques : nouvelles possibilites d'etudes du magnetisme des solides. applications aux couches minces a anisotropies elevees, tbfe 2 et bicouches antiferromagnetique/ferromagnetique, au semi-conducteur semi-magnetique gamnas et aux complexes moleculaires de fe i i a transition de spin“. Toulouse, INSA, 2000. http://www.theses.fr/2000ISAT0011.
Almoussawi, Batoul. „Semi-conducteurs innovants par ingénierie du band gap et manipulation anionique“. Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. https://pepite-depot.univ-lille.fr/LIBRE/EDSMRE/2021/2021LILUR043.pdf.
Mixed anions compounds may allow to reach structures and properties inaccessible in the case of single anion phases, which provide great opportunities for exploratory research of functional mixed anions compounds. One major interest of mixing anions in a phase is the band gap engineering by controlling the contribution of anionic orbitals at the top of the valence band, hence controlling the electronic structure and the properties. In addition, heteroleptic environments around a cation (directly surrounded by at least two types of anions) makes it possible to accentuate the acentric character of a structural entity, and therefore the polarity in the case of a polar arrangement comparing to a mono-anionic analogue. These two aspects combined, i.e. band gap engineering and local acentric character both reached with multiple anions, are powerful to control and exacerbate various properties. With the aim to reach such environments in innovative mixed anion phases and study their physical and chemical properties, several series of potential materials were formulated based on interesting mixed anion building blocks and their synthesis attempted. In this work, a wide variety of new systems are presented, including some unusual environments and properties: Non-linear optical properties, magnetic properties and photoelectric properties . Among these compounds, a large series of new compounds, including Ba5(VO2S2)2(S2)2, characterized by heteroleptic thiovanadates (VO2S2, VO3S, VOS3) and the presence of dichalcogenide pairs are described. From those building blocks, our strategy to reach polar phases was successful with one of those compounds showing interesting non-linear optical properties (SHG). Also, a series of versatile halide-thiovanadates phases (halide= F, Cl and I) could also be developed and proves the appearance of a photoelectric current under visible light. In addition, their calculated bands alignment with respect to H2 and O2 evolution reactions makes them potential candidates for photocatalysis of water-splitting under visible light. On another hand, the first Fresnoite oxysulfide (polar) with SHG properties is also presented. Finally, magnetic phases were also developed like the non-centrosymmetric Ba10Fe7.75Zn5.25S18Si3O12, with (Fe/Zn)3O mixed anion tetrahedra involved in an original large magnetic cluster as elementary block. Those series of compounds are discussed with combination of DFT calculations in order to deliver a comprehension of their structure-properties relationships to help further design functional mixed anion materials
Vitucci, Francesco Maria. „Propriétés optiques et magnétiques de matériaux multiferroïques : gaFeO3 et LuFe2O4“. Thesis, Tours, 2010. http://www.theses.fr/2010TOUR4017/document.
We present a contribution to the study of structural, electronic and magnetic propertiesof multiferroic compounds. These materials – characterized by the coexistence and coupling of different types of long-range orders, such as magnetic and ferroelectic – have recently become a subject of great importance because of their academic interest and their significance for potential applications. In this context we have studied the two compounds GaFeO₃ and LuFe₂O₄. The study involved the use of several techniques : electronic spin resonance (ESR), magnetic measurements by magnetometry and infrared spectroscopy (IR).Local and macroscopic magnetic measurements reveal an anomalous paramagnetic phase in GaFeO3. This is attributed to the existence of short-range magnetic correlations in a wide temperature range above the ordering temperature. On the other hand, the analysis of IR phonon spectra recorded at different temperatures (10 ≤ T ≤ 1000 K) shows that the ordering of magnetic moments does not affect the structural properties of GaFeO₃ For LuFe₂O₄, conversely, the magnetic degrees of freedom are coupled to the structural properties via the charge ordering of Fe³+/Fe²+ ions, as suggested by ESR and IR spectroscopy
Aïnane, Abdelmajid. „Propriétés électroniques et optiques des trions excitoniques dans les semi-conducteurs bidimensionnels : étude de l'action d'un champ magnétique uniforme“. Metz, 1991. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1991/Ainane.Abdelmajid.SMZ915.pdf.
This thesis is devoted to the study of excitonic trions in bidimensional semiconductors (S. C. ). These quasi-particles can be the result, assuming some conditions, of the binding of an exciton and an electron or a hole in semiconductors. They differ from others excitonic "complexes" by their charge and mobility winch allow some original properties, especially in quasi-bidimensional semiconductors (S. C. Superlattices, quantum wells). The study of excitonic trions is of great interest for theory as well as for experiment. It allows the understanding of "radiative" recombination mechanisms winch control some devices in optoelectonic or telecommunication. This study also provides to fundamental physics new models for systems containing few particles. This work allows to point out that, in the absence of magnetic field, these quasi-particles are much more stable in bidimensional S. C. That in 3D S. C. . Therefore, their observation should be easier in 2D media. Moreover room temperature studies may become possible for such quasi-particles. We have shown that the absorption line shape differs from that of excitons or other localized excitonic complexes. Their identification is therefore easier. We have shown that the influence of a magnetic field on trions leads to an increasing and additional quantifization of the S. C. Surface on the quantifization degree. This quantifization is total with a magnetic field perpendicular to plane and minimal with the field parallel to plane. For a weak enough magnetic field, the trions behave as free and charged quasi-particles. In this case, the magnetic field gives rises to landau levels as in 3D S. C. . With a perpendicular magnetic field, the magnetoabsorption reduces to Dirac peaks. However, with a parallel field, there appears a series of lines decreasing in the low energy region below a main absorption edge. Our results are original and specific to excitonic trions. They can help in proving the occurence and the identification of these quasi-particles in quasi-bidimensional media (super lattices S. C. And quantum wells)
Malonga, Frédéric. „Propriétés électroniques et optiques des superréseaux semiconducteurs contraints suivant [001] et [111]“. Montpellier 2, 1995. http://www.theses.fr/1995MON20267.
Almuneau, Guilhem. „Etude et réalisation de lasers à cavité verticale à 1,55 mum sur GaSb“. Montpellier 2, 1998. https://tel.archives-ouvertes.fr/tel-00006831.
Barthem, Vitoria Maria T. Souza. „Propriétés magnétiques et magnétoélastiques de composés hexagonaux RNi5 (R = Terre rare)“. Grenoble 1, 1987. http://www.theses.fr/1987GRE10044.
Sdaq, Abdallah. „Etude des propriètés de transport electronique sous champ magnétique intense des multicouches C/W et Ni/Ti“. Toulouse 3, 1992. http://www.theses.fr/1992TOU30265.
Bücher zum Thema "Composés semiconducteurs – Propriétés magnétiques – Propriétés optiques":
T, Kobayashi, und Kobunshi Sozai Center (Japan), Hrsg. Nonlinear optics of organics and semiconductors: Proceedings of the international symposium, Tokyo, Japan, July 25-26, 1988. Berlin: Springer-Verlag, 1989.