Literatura académica sobre el tema "Exciton g-Factor"
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Artículos de revistas sobre el tema "Exciton g-Factor"
SCHMIDT, T., L. WORSCHECH, M. SCHEIBNER, T. SLOBODSKYY, L. W. MOLENKAMP y A. FORCHEL. "SPIN POLARIZATION IN SEMIMAGNETIC CdMnSe/ZnSe QUANTUM DOTS WITH ZERO EXCITON g FACTOR". International Journal of Modern Physics B 21, n.º 08n09 (10 de abril de 2007): 1626–31. http://dx.doi.org/10.1142/s0217979207043324.
Texto completoLalitha, D., A. John Peter y Chang Woo Lee. "Magneto-trions in a GaMnAs/Ga0.6Al0.4As Quantum Dot". International Journal of Nanoscience 14, n.º 05n06 (octubre de 2015): 1550023. http://dx.doi.org/10.1142/s0219581x15500234.
Texto completoN. R. Senthil Kumar, N. R. Senthil Kumar, A. John Peter A. John Peter y Chang Woo Lee Chang Woo Lee. "Optical properties of excitons in strained Gax In1-xAs/GaAs quantum dot: ef fect of geometrical conf inement on exciton g-factor". Chinese Optics Letters 11, n.º 8 (2013): 082501–82507. http://dx.doi.org/10.3788/col201311.082501.
Texto completoJu, Long, Lei Wang, Ting Cao, Takashi Taniguchi, Kenji Watanabe, Steven G. Louie, Farhan Rana et al. "Tunable excitons in bilayer graphene". Science 358, n.º 6365 (16 de noviembre de 2017): 907–10. http://dx.doi.org/10.1126/science.aam9175.
Texto completoFaria Junior, Paulo E., Klaus Zollner, Tomasz Woźniak, Marcin Kurpas, Martin Gmitra y Jaroslav Fabian. "First-principles insights into the spin-valley physics of strained transition metal dichalcogenides monolayers". New Journal of Physics 24, n.º 8 (1 de agosto de 2022): 083004. http://dx.doi.org/10.1088/1367-2630/ac7e21.
Texto completoBurakowski, M., P. Mrowiński, M. Gawełczyk, J. P. Reithmaier, S. Höfling y G. Sęk. "Diamagnetic coefficients and g-factors of InAs/InGaAlAs quantum dashes emitting at telecom wavelengths". Journal of Applied Physics 132, n.º 14 (14 de octubre de 2022): 144301. http://dx.doi.org/10.1063/5.0101345.
Texto completoTuryanska, L., R. J. A. Hill, O. Makarovsky, F. Moro, A. N. Knott, O. J. Larkin, A. Patanè et al. "Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals". Nanoscale 6, n.º 15 (2014): 8919–25. http://dx.doi.org/10.1039/c4nr02336f.
Texto completoLacroix, Y., C. A. Tran, S. P. Watkins y M. L. W. Thewalt. "Optical identification of the exciton–polariton in epitaxial InAs". Canadian Journal of Physics 74, S1 (1 de diciembre de 1996): 212–15. http://dx.doi.org/10.1139/p96-861.
Texto completoKlotz, F., V. Jovanov, J. Kierig, E. C. Clark, D. Rudolph, D. Heiss, M. Bichler, G. Abstreiter, M. S. Brandt y J. J. Finley. "Observation of an electrically tunable exciton g factor in InGaAs/GaAs quantum dots". Applied Physics Letters 96, n.º 5 (febrero de 2010): 053113. http://dx.doi.org/10.1063/1.3309684.
Texto completoQuax, G. W. W., T. E. J. Campbell Ricketts, A. M. Yakunin, T. van Lippen, R. Nötzel, P. M. Koenraad, C. A. C. Bosco, J. H. H. Rietjens, B. Koopmans y A. Yu Silov. "All-optical control of the exciton g-factor in InAs/GaAs quantum dots". Physica E: Low-dimensional Systems and Nanostructures 40, n.º 6 (abril de 2008): 1832–35. http://dx.doi.org/10.1016/j.physe.2007.10.089.
Texto completoTesis sobre el tema "Exciton g-Factor"
Wang, Shuli. "Étude des propriétés électroniques des perovskites bidimensionnelles à halogénure métallique par spectroscopie magnéto-optique". Electronic Thesis or Diss., Toulouse, INSA, 2023. http://www.theses.fr/2023ISAT0004.
Texto completoAbstract: In recent years, two-dimensional (2D) perovskite materials have attracted considerable attention duo to their unique and excellent electronic and optical properties, which make them an extremely promising semiconductor for light-emitting and display applications. Furthermore, the nonmagnetic perovskite can be semi magnetic semiconductor by incorporating magnetic impurities into lattices of the host perovskite to introduce magnetic properties. The coexistence of both excellent optoelectronic and magnetic properties, makes semi magnetic 2D perovskite to be a considerably promising material for opto-spintronic semiconductor devices for information processing and communications.In this thesis, we explore the electronic and optical properties of 2D perovskites via magneto-optical spectroscopy. We start from performing magneto-photoluminescence (PL) and magneto-transmission measurements on CsPbBr3-based nanoplatelets with a different thickness of the lead-halide slab, ranging from 2 to 4 layers of lead-halide octahedral plane. By applying in-plane magnetic fields up to 65 T, the optically inactive dark excitonic state is brightened. This approach allows us to directly observe an improvement of the PL emission on the low-energy side of the PL spectrum, which indicates that the optically inactive dark excitonic state is the lowest-lying state in these nanoplatelets. Additionally, combining our magneto-PL and magneto-transmission results with theoretical predictions of the exciton fine structure splitting, we accurately determine the energy splitting between the dark and bright excitons. We demonstrate that indeed the dark-bright exciton splitting increases with decreasing layers of lead-halide octahedral plane. We also demonstrate that the efficient emission from these nanoplateltes is due to a phonon bottleneck effect, which significantly reduces the relaxation of the photo excited excitons to the optically inactive dark state.Finally, we investigate the electronic properties of Mn-doped 2D (PEA)2PbI4 perovskite via magneto-transmission spectroscopy for various Mn molar fractions. We find that the exciton Lande g-factor can be controlled by the incorporated Mn concentration. With increasing Mn concentration x from 0 to 2%, the g-factor increases, which we attribute to the sp-d exchange interaction between band-edge excitons and spins hosted in Mn ions. If the Mn concentration is increased further, up to 5%, the exciton g-factor decreases. This anomalous counter-trend is attributed to the Mn-Mn interactions, which result in an effective anti-ferromagnetic coupling
Gonzalez, Hernandez Felix Guillermo. "Tempos de relaxação e decoerência em ensembles de pontos quânticos". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277852.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: Medidas experimentais foram realizadas para determinar as escalas de tempo de relaxação e decoerência do spin eletrônico como bit quântico. A estrutura dos estados de exciton foi investigada com o objetivo de servir como estados intermediários na manipulação do spin. O sistema utilizado para o estudo de decoerência é um ensemble de pontos quânticos auto-formados semicondutores. Dois temas servem como eixos centrais dos três experimentos desenvolvidos nesta tese: a polarização de spin e o fator g de Landé. No primeiro experimento, ao incluir o efeito do reservatório térmico, foi obtido o grau de polarização do spin (populações dos níveis up e down) para as camadas s e p. O desdobramento dos níveis orbitais em subníveis de spin permitiu obter a magnitude do fator g para estes estados. Mudando a orientação do campo magnético, foram observadas as anisotropias do tensor g e a sua relação com os detalhes do potencial de confinamento. Estas características permitiram inferir o tempo de relaxação T1. A medida da polarização resolvida no tempo foi realizada através de es-pectroscopia óptica de bombeio-prova. Os pulsos de luz e o campo magnético transverso permitem que uma polarização líquida seja inicializada. A rotação de Kerr permitiu observar oscilações desta polarização em torno do campo magnético com freqüência determinada pelo fator g. A perda da coerência de fase do spin resulta no decaimento destas oscilações numa escala de tempo T2. Medidas realizadas num ensemble de spins implicam em que o tempo de decoerência encontra-se limitado pela escala de defasagem T¤2< T2. Uma técnica semelhante à refocalização por spin-eco em experimentos de ressonância magnética nuclear, foi aplicada utilizando pulsos de laser para reverter a defasagem do ensemble. Tanto a possibilidade de medir o sinal de eco como o tempo de decoerência foram medidos como função da temperatura. A estrutura de níveis de exciton e a sua distribuição no ensemble foi estudada também com espectroscopia de bombeio-prova. Foram observados batimentos quânticos entre os níveis de estrutura fina do exciton para sis-temas 0D e 2D limitados pelo tempo de recombinação
Abstract: Experimental measurements were carried out to determine the scales of the relaxation and decoherence time for the electronic spin as quantum bit. The structure of the exciton states was investigated with the objective to serve as intermediate states in the spin manipulation. The system studied for the implementation of the quantum computation is an ensemble of self-assembled semiconductor quantum dots. Two subjects serve as central axes of the three experiments developed in this thesis: the spin polarization and the Landé g-factor. In the first experiment, when including the effect of the thermal reservoir, the degree of spin polarization (populations for the up and down levels) was measured for layers s and p. The splitting of the orbital levels in spin sublevels allowed to get the magnitude of factor g for these states. Changing the orientation of the magnetic field, the g-tensor anisotropies and its relation with the details of the confinement potential had been observed. These characteristics had allowed to infer the relaxation time T1. The time resolved polarization measurement was carried out by optical pump-probe spectroscopy. The pulses of light and the transverse magnetic field allow the initialization of a net polarization. The Kerr rotation allowed to observe oscillations of this polarization around the magnetic field with frequency determined for factor g. The loss of the spin phase coherence results in the decay of these oscillations in a time scale T2. Measurements carried out in an ensemble of spins imply that the decoherence time is limited by the ensemble dephasing time T¤2 < T2. A technique similar to the spin-echo refocalization in nuclear magnetic resonance experiments using laser pulses was applied to reverse the ensemble dephasing. The possibility to measure the echo signal and the decoherence time was measured as a function of the temperature. The structure of exciton levels and its distribution in ensemble were also studied with pump-probe spectroscopy. Quantum beats were observed be-tween the fine structure exciton levels for 0D and 2D systems, yet limited by the recombination time
Doutorado
Física da Matéria Condensada
Doutor em Ciências
Godoy, Marcio Peron Franco de. "Propriedades de pontos quânticos de InP/GaAs". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277715.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
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Resumo: Neste trabalho estudamos as propriedade estruturais e ópticas de pontos quânticos auto-organizados de InP crescidos sobre o substrato de GaAs. Esta estrutura apresenta o alinhamento de bandas tipo-II na interface, confinando o elétron no ponto quântico, enquanto o buraco mantém-se na barreira, próximo à interface devido à interação coulombiana atrativa. As amostras foram crescidas por epitaxia de feixe químico (CBE) no modo Stranskii-Krastanov. Os pontos quânticos apresentam raio médio de 25 nm e grande dispersão de altura (1-5 nm) e ocorre a relaxação parcial do parâmetro de rede, chegando a 2 %, em pontos quânticos superficiais. Do ponto de vista de propriedades ópticas, a fotoluminescência de pontos quânticos superficiais exibe uma eficiente emissão óptica, devido a baixa velocidade de recombinação dos estados superficiais do InP, e reflete a densidade e distribuição bimodal de tamanhos. Além disso, sua emissão óptica em função da intensidade de excitação exibe comportamento diverso em comparação com pontos quânticos cobertos com uma camada de GaAs. Em pontos quânticos cobertos, determinamos a energia de ativação térmica, que varia de 6 a 8 meV, e é associada à energia de ligação do éxciton ou energia de ionização do buraco. O decaimento temporal da luminescência de pontos quânticos é de 1,2 ns, um tempo relativamente curto para um ponto quântico tipo-II. A análise das propriedades magneto-ópticas em pontos quânticos individuais, inédita em QDs tipo-II, permitiu verificar que o fator-g do éxciton é praticamente constante, independentemente do tamanho dos QDs, devido ao fato dos buracos estarem levemente ligados. Por fim, mostramos a versatilidade do sistema acoplando-o a um poço quântico de InGaAs. Este acoplamento introduz mudanças na superposição das funções de onda do par elétron-buraco que permitem a manipulação do tempo de decaimento da luminescência e da energia de ligação excitônica
Abstract: We have investigated structural and optical properties of InP self-assembled quantum dots grown on GaAs substrate. This system presents a type-II band lineup where only electrons are confined in the InP quantum dots. The InP/GaAs quantum dots were grown by chemical beam epitaxy in the Stranskii-Krastanov mode. Our quantum dots present a mean radius of 25 nm and large height dispersion, 1-5 nm, and a partial relieve of the strain up to 2 % is observed. The photoluminescence spectra of surface quantum dots show an efficient optical emission, which is attributed to the low surface recombination velocity in InP. We observed a bimodal dispersion of the dots size distribution, giving rise to two distinct emission bands. A remarkable result is the relatively large blue shift of the emission band from uncapped samples as compared to those for capped dots. In capped quantum dots, we obtained the thermal activation energy, from 6 to 8 meV, which is associated to the exciton binding energy or hole ionization energy. The observed luminescence decay time is about 1.2 ns, relatively short decay time for type II system. We investigated magneto-optical properties using single-dot spectroscopy. The values of the exciton g factor obtained for a large number of single InP/GaAs dots are mainly constant independent of the emission energy and, therefore, of the quantum dot size. The result is attributed to the weak confinement of the holes in InP/GaAs QDs. We have also investigated structures where InP quantum dots are coupled to a InGaAs quantum well. This system permits the manipulation of the wave function overlap between electron-hole in order to control the optical emission decay time and exciton binding energy
Doutorado
Física
Doutor em Ciências
Kucharska, A. I. "Measurement of g-factors of excited states in some medium mass nuclei using the Transient Field Technique". Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375280.
Texto completoRaskin, Maxim. "Ultraschnelle Ladungsträger- und Spindynamik in II-VI und III-V Halbleitern mit weiter Bandlücke". Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-125227.
Texto completoSAGE, FRANCOISE. "Pompage optique du niveau metastable **(3)p : :(o) de la premiere configuration excitee des isotopes impairs des gaz rares". Caen, 1985. http://www.theses.fr/1985CAEN2039.
Texto completoCapítulos de libros sobre el tema "Exciton g-Factor"
Meyer, B. K. "ZnO: exciton g-factors". En New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 582. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_323.
Texto completoMeyer, B. K. "GaN, hexagonal modification: exciton g-factors". En New Data and Updates for I-VII, III-V, III-VI and IV-VI Compounds, 251. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-48529-2_113.
Texto completoWindle, Michael. "Introduction and Overview of Statistical Approaches to Gene × Environment Interactions for Complex Phenotypes". En Statistical Approaches to Gene X Environment Interactions for Complex Phenotypes. The MIT Press, 2016. http://dx.doi.org/10.7551/mitpress/9780262034685.003.0001.
Texto completoCalvert, Jack G., John J. Orlando, William R. Stockwell y Timothy J. Wallington. "Mechanisms of Ozone Reactions in the Troposphere". En The Mechanisms of Reactions Influencing Atmospheric Ozone. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190233020.003.0005.
Texto completoActas de conferencias sobre el tema "Exciton g-Factor"
Senthilkumar, N. R. y A. John Peter. "Effects of gallium alloy content and the geometrical confinement on effective exciton g-factor in a III-V semiconductor quantum dot". En SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791389.
Texto completoStuchbery, Andrew E. "Excited-state g-factor measurements with radioactive ion beams". En MAPPING THE TRIANGLE: International Conference on Nuclear Structure. AIP, 2002. http://dx.doi.org/10.1063/1.1517982.
Texto completoSTONE, N. J. "METHODS FOR G-FACTOR MEASUREMENTS ON SHORT-LIVED EXCITED STATES USING RADIOACTIVE BEAMS". En Proceedings of the International Symposium. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702401_0044.
Texto completoTaylor, M. J. "g Factor Measurement of the Excited 2+ State in the fp Shell Nucleus 44Ca". En MAPPING THE TRIANGLE: International Conference on Nuclear Structure. AIP, 2002. http://dx.doi.org/10.1063/1.1517984.
Texto completoGuevara, Z. E. y D. A. Torres. "Lifetime and g-factor measurements of excited states using Coulomb excitation and alpha transfer reactions". En THERMOPHYSICS 2016: 21st International Meeting. Author(s), 2016. http://dx.doi.org/10.1063/1.4955347.
Texto completoGuan, Huapeng, Robert W. Hellwarth, Jouni P. Partanen y Nansheng Tang. "The optical polarizability of excited C60 molecules". En Nonlinear Optics: Materials, Fundamentals and Applications. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/nlo.1996.nthe.10.
Texto completoBochove, E. J. y P. W. Milonni. "Radiative Momentum Transfer to Atoms by a Phase-Conjugate Mirror". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.pd8.
Texto completoWang, Qi, Da Xing, Wei Liu, Yongkang Cheng y Zuguang Ma. "Study of stimulated emission from high-lying F ′ Σ g + — B ′ Π 4 and new cascade radiation in Na2". En International Laser Science Conference. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.ff4.
Texto completoRAMAYYA, A. V., C. GOODIN, K. LI, J. K. HWANG, J. H. HAMILTON, Y. X. LUO, A. V. DANIEL et al. "TECHNIQUE FOR MEASURING ANGULAR CORRELATIONS AND g-FACTORS OF EXCITED STATES WITH LARGE MULTI-DETECTOR ARRAYS: AN APPLICATION TO NEUTRON RICH NUCLEI PRODUCED IN SPONTANEOUS FISSION". En Proceedings of the 9th International Spring Seminar on Nuclear Physics. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812779038_0007.
Texto completoSaikia, Bhaskarjyoti, Girish Kulkarni, Hrushikesh Sathe, Pravin Kakde, Tanmay Vyas y Yiran Li. "Prediction of Exhaust System Vibration Through Harmonic Analysis & High Cycle Fatigue Life Evaluation". En ASME 2021 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icef2021-67753.
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