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Статті в журналах з теми "Bruit de spin"
Orsal, B., R. Alabedra, M. Valenza, G. Lecoy, J. Meslage та C. Boisrobert. "Les photodiodes à avalanche Hg0,4Cd0,6Te à λ = 1,55 μm. Bruit près de la résonance due au couplage spin-orbite". Revue de Physique Appliquée 22, № 4 (1987): 227–33. http://dx.doi.org/10.1051/rphysap:01987002204022700.
Повний текст джерелаBouteloup, Philippe. "Bruit des villes et bruit des champs." Spirale N° 68, no. 4 (2013): 84. http://dx.doi.org/10.3917/spi.068.0084.
Повний текст джерелаDequiré, Anne-Françoise. "Quand les minutes de silence au collège font grand bruit." Spirale - Revue de recherches en éducation N° 67, no. 1 (2021): 127. http://dx.doi.org/10.3917/spir.067.0127.
Повний текст джерелаMüh, Roger. "Le bruit s'organise, joue avec le silence et devient musique." Spirale 53, no. 1 (2010): 109. http://dx.doi.org/10.3917/spi.053.0109.
Повний текст джерелаRao, Shashank Vittal, Matteo Piccardo, and Alessandro Soncini. "Study of the most relevant spin–orbit coupling descriptions of magnetic excitations in a series of lanthanide complexes." Physical Chemistry Chemical Physics 24, no. 15 (2022): 9007–17. http://dx.doi.org/10.1039/d1cp05469d.
Повний текст джерелаGHOSH, S., and S. MUKHERJEE. "BREIT-FERMI INTERACTIONS AND FINE-HYPERFINE SPLITTING IN HEAVY QUARKONIA." Modern Physics Letters A 04, no. 13 (July 10, 1989): 1277–85. http://dx.doi.org/10.1142/s0217732389001465.
Повний текст джерелаDuan, Jun-Xin, Yun Zhou, Zhi-Zhong Xie, Tao-Lei Sun, and Jun Cao. "Incorporating spin–orbit effects into surface hopping dynamics using the diagonal representation: a linear-response time-dependent density functional theory implementation with applications to 2-thiouracil." Physical Chemistry Chemical Physics 20, no. 22 (2018): 15445–54. http://dx.doi.org/10.1039/c8cp01852a.
Повний текст джерелаDAREWYCH, JURIJ W., MARKO HORBATSCH, and ROMAN KONIUK. "RELATIVISTIC CHARGED PARTICLE SCATTERING WITH SPIN SPIN INTERACTIONS." International Journal of Modern Physics E 01, no. 01 (March 1992): 147–67. http://dx.doi.org/10.1142/s0218301392000072.
Повний текст джерелаLiu, Qing, Jiguang Li, Jianguo Wang, and Yizhi Qu. "Effect of Electron Correlation and Breit Interaction on Energies, Oscillator Strengths, and Transition Rates for Low-Lying States of Helium." Chinese Physics Letters 38, no. 11 (December 1, 2021): 113101. http://dx.doi.org/10.1088/0256-307x/38/11/113101.
Повний текст джерелаYarkony, David R. "Spin-forbidden chemistry within the Breit-Pauli approximation." International Reviews in Physical Chemistry 11, no. 2 (September 1992): 195–242. http://dx.doi.org/10.1080/01442359209353270.
Повний текст джерелаДисертації з теми "Bruit de spin"
Bouchiat, Hélène. "Transition verre de spin : comportement critique et bruit magnétique." Paris 11, 1986. http://www.theses.fr/1986PA112055.
Повний текст джерелаThis thesis is devoted to two different problems concerning the spin-glass transition. 1. The first part concerns the study of the critical behavior of the nonlinear magnetization, which is related to the spin-glass-order-parameter singularity at the transition temperature. Our results in the AgMn, CuMn, AgMn Au and CuMn Au spin-glass systems support the existence of a phase transition for which we determine the critical exponents, whose values are different from the mean-field ones. We discuss and investigate the influence of the regular terms and anisotropy on the critical behavior. The study of the non-linear magnetization below Tg suggests that it remains singular near H = 0 over the whole law-temperature phase. Preliminary results in the YEr system raise the question of the coexistence of a spin-glass-like order with long-range antiferromagnetic order. 2. The second part concerns an investigation of the spin-glass dynamics, by studying the magnetic fluctuations without any exciting field. The noise power spectrum is found to vary like 1/f over at least 5 decades of frequency. Its comparison with susceptibility measurements shows the applicability of the linear-response and fluctuation-dissipation theorem to spin glasses when time-correlation functions and response functions are measured when the system is prepared under the same conditions for the two experiments. Aging effects are also investigated
Bouchiat, Hélène. "Transition verre de spin comportement critique et bruit magnétique." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37596281w.
Повний текст джерелаCucchiara, Julien. "Spin transfer effects in nanopillars with perpendicular magnetizations." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10008/document.
Повний текст джерелаThe discover of spin-transfer opens a new way to control the magnetization of a nano-magnet using a spin polarized current instead of a magnetic field. Many studies showed that it is particularly efficient in nanopillar spin-valves with perpendicular magnetizations. Therefore, we decided to analyse into more details the impact of a spin polarized current on these devices during this thesisFirst, we were interested in a global approach of the behavior of these systems based on the understanding of their field and current phase diagrams. Comparing our experimental re-sults with various theoretical predictions, we demonstrated that their main features are ex-plained by a breaking of the uniaxial symmetry of the spin-valves due, for instance, to a non-perpendicular anisotropy axis or applied magnetic field. Moreover, we developed a purely energetic description of these devices allowing to understand simply the physical origin of their behavior.Then, we focused on the magnetization reversal process of these nanopillars dominated by a domain nucleation followed by domain wall propagation. We combined for this study the analysis of a thermally activated phenomenon called telegraph noise, of phase diagrams and of micromagnetic simulations. They all lead to the conclusion that the nucleation process is well described by a Stoner-Wohlfarth behaviour whereas the propagation process seems very dependent on the structure of the domain wall especially for the action of the spin-transfer
Hérisson, Didier. "Mesures de relations de fluctuation-dissipation dans un verre de spin." Paris 11, 2002. https://tel.archives-ouvertes.fr/tel-00002055.
Повний текст джерелаLiu, Shikang. "Spin noise spectroscopy in metatable helium." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASP051.
Повний текст джерелаThis PhD thesis mainly addresses the spin noise spectroscopy of metastable helium.We report for the first time the measurement of spontaneous spin noise of metastable helium atom ensemble using non-invasive spin noise spectroscopy.We utilize an off-resonant laser to investigate the random fluctuations of the Zeeman states of the ground level of metastable helium with a mild magnetic field of approximately 1 Gauss. Moreover, we examine the changes in the spectral pattern when the probe approaches the resonance.We investigate the two main types of polarization noise of the probe, namely Faraday rotation noise and ellipticity noise. To replicate the experimental spin noise signal qualitatively and quantitatively, we construct a simulation model that performs well even near resonance.After the investigation of simpler level structure of metastable helium transition line, we extend spin noise spectroscopy to the transition lines with more complicated structures.Our simulation results are consistent with the experimental findings, which are distinct from those obtained using the simpler level structure. To explain the SNS pattern's characteristics near different transition lines, we have developed a comprehensive theoretical model based on the superposition states theory.We then investigate the correlation between Faraday rotation noise and ellipticity noise. Using the eight noise modes of spin-1, we are able to explain the correlation under different conditions. Additionally, we study the effect of magnetic field noise on the SNS pattern. The magnetic field noise is found to alter the noise spectra pattern, and the eight noise modes theory is able to well explain this phenomenon well.This PhD work mainly serves as proof of principle. The simple level structure of metastable helium provids an ideal model to study the phenomenon of spin noise spectroscopy in spin-1 systems. These findings provide a new perspective to understand SNS and the characterization of spin-1 systems, which can aid further research in this area
Neveu, Pascal. "Propagation de lumière dans l'hélium métastable : stockage, amplification, fluctuations et bruit quantique." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN044/document.
Повний текст джерелаA quantum state of light is characterized by its statistics of number of photons. These statistics can change in the presence of coherent phenomena. This PhD focuses both experimentally and theoretically on the propagation of quantum states within a room temperature vapor of metastable helium. First, we show that ultranarrow coherent population oscillations allow to efficiently store a specific quadrature of a light wave. Nevertheless, this protocol cannot be use to store the two quadratures of a light field. Indeed, the propagation conditions deteriorates its statistical properties, forbidding its use for quantum application. Secondly, we show that it is possible to generate twomode squeezed states of light in that system. High amplification can be achieved (9 dB), exploiting the strong nonlinearities enabled by coherent population trapping of a transition, and because of the energy level structure. Finally, we study atomic spin noise transfer to light polarization noise via Faraday effect. These fluctuations, probed by spin noise spectroscopy, show original behaviors that may be useful in another systems
Abbas, Chahine. "Optical spectroscopy of indirect excitons and electron spins in semiconductor nanostructures." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS049.
Повний текст джерелаThis work provides an optical study of spin dynamics in two different systems: electrons gas in n-doped CdTe thin layers, and indirect excitons in asymmetric GaAs coupled quantum wells. Time and polar resolved photoluminescence and pump-probe spectroscopy allowed the determination of both the lifetime and the relaxation time of indirect excitons.The global behaviour of the dedicated biased sample has been described, major technical constraints have been pointed out and optimal working conditions have been identified. In photoluminescence, we obtained a lifetime of 15 ns and a spin relaxation time of 5 ns. Pump-probe spectroscopy with an exceptional delay range shown that longer characteristic times could be obtained increasing the delay between two laser pulses.An other optical method has been used to study electrons in CdTe thin layers. Spin noise spectroscopy has recently emerged as an ideal tool to study dynamics of spin systems through their spontaneous fluctuations which are encoded in the polarisation state of a laser beam by means of Faraday rotation. Common spin noise setups provide only temporal fluctuations, spatial information being lost averaging the signal on the laser spot. Here, we demonstrate the first implementation of a spin noise setup providing both spatial and temporal spin correlations thanks to a wave vector selectivity of the scattered light. This gave us the opportunity to measure both the spin relaxation time and the spin diffusion coefficient. This complete vision of the spin dynamics in CdTe has been compared to our understanding of spin physics in GaAs. Against all odds, this knowledge seems not to be directly transposable from GaAs to CdTe
Quinsat, Michaël. "Etude d'un auto-oscillateur non-isochrone : Application à la dynamique non-linéaire de l'aimantation induite par transfert de spin." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY083/document.
Повний текст джерелаSpin Torque Oscillators (STO) are nano-sized Radio-Frequency oscillators whose frequency agility can be tuned by an order of magnitude. This tuning originates from the non-linear properties of the underlying magnetization dynamics that is induced by spin transfer torque (STT) in multilayered magnetic nanostructures. Being highly tunable in frequency has the inconvenient of creating a very strong sensitivity to noise. As a result the spectral purity of STOs is far below the one required for applications for instance in telecommunications. The magnetization dynamics induced by STT has been described theoretically in the frame of nonlinear spin wave theory that makes the essential features of the underlying properties very transparent. However important information on the excitation mode are "buried" in phenomenological parameters such as NU the amplitude-phase coupling and Gp the amplitude relaxation rate. Determining these parameters with accuracy from experiments is thus an important issue. This thesis describes several experimental methods to extract these parameters. The first is time domain noise spectroscopy which permits to extract phase and amplitude noise Power Spectral Densities. Their analysis in the frame of theoretical models allows direct extraction of the nonlinear parameters, but also to quantify the technological relevant phase noise. This is demonstrated for magnetic tunnel junction devices. A second method is the analysis of higher harmonics linewidth, where it is shown that due to the non-isochronous property of STOs, the relationship between Dfn and Df1 is non-trivial and allows to extract NU and Gp. We then apply the information gathered on the autonomous dynamics of STOs to understand the non-autonomous dynamics of STOs that are a prerequisite for the use of STOs in complex RF architectures. It is shown experimentally how the nonlinear parameters influence this non-autonomous behaviour
Cucchiara, Julien. "Effets de transfert de spin dans des nanopiliers aux aimantations perpendiculaires." Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00614929.
Повний текст джерелаWittrock, Steffen. "From noise & stability to synchronization & complex dynamics in spin torque nano-oscillators." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS088.
Повний текст джерелаSpin torque nano-oscillators (STNOs) present unique potential functionalities for rf-communications, energy harvesting or next-generation computing. Therewith, they unify hardware multifunctional key capabilities in the framework of Industry 4.0 and emphasize the potentialities of spintronics, even beyond the paradigm of CMOS. Along with the STNO’s nano-size, radiation-hardness, frequency tunability, low energy consumption and CMOS compatibility, their key characteristics is their strong nonlinearity, which opens up the path to various interesting physical phenomena. However, their nonlinearity also causes the oscillators’ poor spectral coherence, which so far limits their applicability in real practical devices. This PhD thesis aims at providing a deeper understanding of the STNO’s noise in the framework of nonlinearity. Generalizable to all types of spintronic oscillators, we experimentally and theoretically study the contribution of 1/f flicker noise at low frequency offsets in vortex based STNOs. We discuss the influence of this type of noise on the oscillation’s spectral shape and demonstrate potential means for efficient coherence improvements. Moreover, this PhD thesis is also dedicated to the coupling and synchronization of several STNOs, since these capabilities facilitate different applicational schemes in prospective technologies. Indeed, beyond synchronization, novel complex phenomena are experimentally demonstrated and studied, such as the emergence of exceptional points in the coupled system. In summary, the obtained results open up new perspectives not only for the fundamental research on STNOs, but also for novel types of future applications
Книги з теми "Bruit de spin"
Jules & Johnny Austen. Reign in Spain (Adventures of the Brit Pack). Independently Published, 2017.
Знайти повний текст джерелаChance, Christo. Carabanchel: The Last Brit in Europe's Hellhole Prison. Mainstream Publishing, 2005.
Знайти повний текст джерелаDyall, Kenneth G., and Knut Faegri. Introduction to Relativistic Quantum Chemistry. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195140866.001.0001.
Повний текст джерелаThe Hague Court Reports. Great Britain, Spain and France Versus Portugal in the Matter of the Expropriated Religious Properties in Portugal; Awards ... Lisbon on July 31, 1913, Between Great Brit. HardPress Publishing, 2012.
Знайти повний текст джерелаЧастини книг з теми "Bruit de spin"
Meyer, William B. "Introduction." In Americans and Their Weather. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195131826.003.0006.
Повний текст джерелаТези доповідей конференцій з теми "Bruit de spin"
JAFFE, R. L. "COLOR, SPIN, AND FLAVOR-DEPENDENT FORCES IN QUANTUM CHROMODYNAMICS." In The Gregory Breit Centennial Symposium. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811530_0011.
Повний текст джерелаBraun, B., E. M. Gabriel, H. G. Gaul, G. Graw, H. Kolster, A. Metz, K. Reinműller, P. Schiemenz, I. Simiantonakis, and E. Steffens. "A Breit-Rabi polarimeter for internal H/D-targets and the observation of relaxation processes." In The 11th International symposium on high energy spin physics. AIP, 1995. http://dx.doi.org/10.1063/1.48853.
Повний текст джерелаЗвіти організацій з теми "Bruit de spin"
Yarkony, David R. Theoretical Studies of Spin-Forbidden Processes within the Breit-Pauli Approximation. Fort Belvoir, VA: Defense Technical Information Center, January 1990. http://dx.doi.org/10.21236/ada217778.
Повний текст джерела