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Статті в журналах з теми "5108 Quantum physics":

1

Fujita, Kazuue, Shinichi Furuta, Tatsuo Dougakiuchi, Atsushi Sugiyama, Tadataka Edamura та Masamichi Yamanishi. "Broad-gain (Δλ/λ_0~04), temperature-insensitive (T_0~510K) quantum cascade lasers". Optics Express 19, № 3 (27 січня 2011): 2694. http://dx.doi.org/10.1364/oe.19.002694.

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2

Rullière, Claude, Alain Declemy, and Alexandru T. Balaban. "Corrélation entre possibilité d'effet laser et force oscillatrice de la transition fluorescente : cas des sels de pyrylium." Canadian Journal of Physics 63, no. 2 (February 1, 1985): 191–94. http://dx.doi.org/10.1139/p85-029.

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Laser action is demonstrated to occur in seven pyrylium salts between 4100 and 5100 Å with quantum yields extending from 4% to 12%. Theoretical calculations of the energy and oscillator strength of S0 → Sn transitions confirm band assignments deduced from experimental results. These results allow detection of a weak hidden transition in the 2,6-dimethyl-4-phenyl-pyrylium cation where laser action is not observed. This shows how important the magnitude of the oscillator strength of the first transition S0 → S1 is in selecting candidates to laser action. [Traduit par le journal]
3

Tegafaw, Tirusew, Wenlong Xu, Sang Hyup Lee, Kwon Seok Chae, Yongmin Chang, and Gang Ho Lee. "Production of nearly monodisperse Fe3O4 and Fe@Fe3O4 nanoparticles in aqueous medium and their surface modification for biomedical applications." International Journal of Modern Physics B 31, no. 04 (February 6, 2017): 1750014. http://dx.doi.org/10.1142/s021797921750014x.

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Iron (Fe)-based nanoparticles are extremely valuable in biomedical applications owing to their low toxicity and high magnetization values at room temperature. In this study, we synthesized nearly monodisperse iron oxide (Fe3O4) and Fe@Fe3O4 (core: Fe, shell: Fe3O[Formula: see text] nanoparticles in aqueous medium under argon flow and then, coated them with various biocompatible ligands and silica. In this study, eight types of surface-modified nanoparticles were investigated, namely, Fe3O4@PAA (PAA = polyacrylic acid; [Formula: see text] of PAA = 5100 amu and 15,000 amu), Fe3O4@PAA–FA (FA = folic acid; [Formula: see text] of PAA = 5100 amu and 15,000 amu), Fe3O4@PEI–fluorescein (PEI = polyethylenimine; [Formula: see text] of PEI = 1300 amu), Fe@Fe3O4@PEI ([Formula: see text] of PEI = 10,000 amu), Fe3O4@SiO2 and Fe@Fe3O4@SiO2 nanoparticles. We characterized the prepared surface-modified nanoparticles using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) absorption spectroscopy, a superconducting quantum interference device (SQUID), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy and confocal microscopy. Finally, we measured the cytotoxicity of the samples. The results indicate that the surface-modified nanoparticles are biocompatible and are potential candidates for various biomedical applications.
4

Tidrow, Meimei Z. "Device physics and state-of-the-art of quantum well infrared photodetectors and arrays." Materials Science and Engineering: B 74, no. 1-3 (May 2000): 45–51. http://dx.doi.org/10.1016/s0921-5107(99)00532-2.

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5

Dargys, Adolfas. "Control of two-dimensional electron spin by an abrupt change of physical parameters of a quantum well." Lithuanian Journal of Physics 51, no. 1 (2011): 53–63. http://dx.doi.org/10.3952/lithjphys.51108.

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Motta, Nunzio, Anna Sgarlata, Federico Rosei, P. D. Szkutnik, S. Nufris, M. Scarselli, and A. Balzarotti. "Controlling the quantum dot nucleation site." Materials Science and Engineering: B 101, no. 1-3 (August 2003): 77–88. http://dx.doi.org/10.1016/s0921-5107(02)00657-8.

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7

Chichibu, S. F., A. C. Abare, M. P. Mack, M. S. Minsky, T. Deguchi, D. Cohen, P. Kozodoy, et al. "Optical properties of InGaN quantum wells." Materials Science and Engineering: B 59, no. 1-3 (May 1999): 298–306. http://dx.doi.org/10.1016/s0921-5107(98)00359-6.

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8

Renevier, H., M. G. Proietti, S. Grenier, G. Ciatto, L. González, J. M. Garcı́a, J. M. Gérard, and J. Garcı́a. "Glancing angle EXAFS of encapsulated self-assembled InAs/InP quantum wires and InAs/GaAs quantum dots." Materials Science and Engineering: B 101, no. 1-3 (August 2003): 174–80. http://dx.doi.org/10.1016/s0921-5107(02)00708-0.

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9

Viale, Y., P. Gilliot, O. Crégut, J. P. Likforman, B. Hönerlage, R. Levy, L. Besombes, L. Marshal, K. Kheng, and H. Mariette. "Excitonic dynamics in CdTe/ZnTe quantum dots." Materials Science and Engineering: B 101, no. 1-3 (August 2003): 55–59. http://dx.doi.org/10.1016/s0921-5107(02)00649-9.

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Hull, R., J. L. Gray, M. Kammler, T. Vandervelde, T. Kobayashi, P. Kumar, T. Pernell, J. C. Bean, J. A. Floro, and F. M. Ross. "Precision placement of heteroepitaxial semiconductor quantum dots." Materials Science and Engineering: B 101, no. 1-3 (August 2003): 1–8. http://dx.doi.org/10.1016/s0921-5107(02)00680-3.

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Дисертації з теми "5108 Quantum physics":

1

Stevens, Neil. "Concepts surrounding incompatibility in quantum physics." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/8277/.

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This thesis concerns how attempting to measure certain fundamental properties of a physical theory can lead us to new insights. The idea of general probabilistic models is introduced and developed, in order to provide a way to be able to consider and compare different theories. A measure of incompatibility of two observables is defined, through the amount of smearing needed to make them jointly measureable. This measure is then used to characterise the degree of incompatibility that exists in a given theory. Quantum theory is then shown to be as incompatible as any other theory, but only in a very course grained sense. A related way of measuring the strength of incompatibility of a pair of observables is then shown to put a bound on a measure of the strength of non-local correlations. The notion of steering, or remote ensemble preparation, is then shown to be a sufficient condition for the saturation of that bound. Examples are considered that demonstrate that the given sufficient notion of steering is not necessary, and it is proposed how the measures can be modified in cases where the link does not hold. The idea of formulating measures of error and disturbance associated with a measurement device is discussed. The notion of a direct test of error or disturbance is used to analyse current proposed measures, and show their shortcomings.
2

Benassi, Costanza. "On classical and quantum lattice spin systems." Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/108566/.

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This thesis focuses on some results about quantum and classical lattice spin systems. We study a wide class of two-dimensional quantum models which enjoy a U(1) symmetry. Using the so called complex rotation method we show that the decay of the relevant correlation functions is at least algebraically fast. We provide some examples of relevant models which belong to our class. We review some results present in the literature concerning the so called GriffthsGinibre inequalities for the classical XY model and propose a generalisation to its quantum counterpart. Correlation inequalities indeed hold for the quantum XY model with spin- 1 2 and for the ground state of the spin-1 system. We propose some applications of these results, namely that the infinite volume limit of some correlation functions exists and that it is possible to compare quenched and annealed averages for a quantum XY model with random couplings. We investigate loop representations for O(n) classical spin systems. We propose a generalised random current representation and show its relationship with the Brydges-Fröhlich-Spencer one. We review some conjectures regarding the expected behaviour of these loop models { namely that macroscopic loops appear and their lengths are distributed according to a Poisson-Dirichlet distribution. We propose some arguments in favour of these conjectures for O(n) loop models, using a mix of exact results and heuristic considerations. In order to do so we de ne a stochastic process which is an effective split-merge process for macroscopic loops and we reformulate some correlation functions for the O(2) spin system in terms of loop properties.
3

Hollands, Stefan. "Aspects of quantum field theory in curved spacetime." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325670.

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4

Gütschow, Johannes [Verfasser]. "Quantum information processing with Clifford quantum cellular automata / Johannes Gütschow." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2013. http://d-nb.info/1033705470/34.

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Feiler, Cornelia [Verfasser]. "Quantum physics and number theory connected by the Riemann zeta function / Cornelia Feiler." Ulm : Universität Ulm. Fakultät für Naturwissenschaften, 2014. http://d-nb.info/1049561953/34.

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Waldherr, Konrad [Verfasser]. "Numerical Linear and Multilinear Algebra in Quantum Control and Quantum Tensor Networks / Konrad Waldherr." München : Verlag Dr. Hut, 2014. http://d-nb.info/1064560601/34.

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Werner, Albert H. [Verfasser]. "Localization and recurrence in quantum walks / Albert H. Werner." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2013. http://d-nb.info/1046028499/34.

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Wrazidlo, Dominik [Verfasser], and Markus [Akademischer Betreuer] Banagl. "Fold maps and positive topological quantum field theories / Dominik Wrazidlo ; Betreuer: Markus Banagl." Heidelberg : Universitätsbibliothek Heidelberg, 2017. http://d-nb.info/1178009157/34.

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Toussaint, Vladimir. "Particle detectors in fermionic and bosonic quantum field theory in flat and curved spacetimes." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49473/.

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This thesis is concerned with aspects of quantum theory of fields in flat and curved spacetimes of arbitrary dimensions along with detecting bosons and fermions on these spacetimes. The thesis is divided into two main parts. In the first part, we analyse an Unruh-DeWitt particle detector that is coupled linearly to the scalar density of a massless Dirac field (neutrino field) in Minkowski spacetimes of dimension d ≥ 2 and on the two-dimensional static Minkowski cylinder, allowing the detector’s motion to remain arbitrary and working to leading order in perturbation theory. In d-dimensional Minkowski spacetime, with the field in the usual Fock vacuum, we show that the detector’s response is identical to that of a detector coupled linearly to a massless scalar field in 2d-dimensional Minkowski. In the special case of uniform linear acceleration, the detector’s response hence exhibits the Unruh effect with a Planckian factor in both even and odd dimensions, in contrast to the Rindler power spectrum of the Dirac field, which has a Planckian factor for odd d but a Fermi-Dirac factor for even d. On the two-dimensional cylinder, we set the oscillator modes in the usual Fock vacuum but allow an arbitrary state for the zero mode of the periodic spinor. We show that the detector’s response distinguishes the periodic and antiperiodic spin structures, and the zero mode of the periodic spinor contributes to the response by a state-dependent but well defined amount. Explicit analytic and numerical results on the cylinder are obtained for inertial and uniformly accelerated trajectories, recovering the d = 2 Minkowski results in the limit of large circumference. The detector’s response has no infrared ambiguity for d = 2, neither in Minkowski nor on the cylinder. In the second part, firstly, we give a thorough discussion for the Bogolubov transformation for Dirac field, and discuss pair creation in a non-stationary spacetime. Secondly, we derive the in and out vacua Wightman two-point functions for the Dirac field and the Klein-Gordon field for certain class of spatially flat Friedmann-Robertson-Walker (FRW) cosmological spacetimes wherein the two-point functions have the Hadamard form. We then establish the equivalence between the adiabatic vacuum of infinite order and the conformal vacuum in the massless limit. With the field in the conformal Fock vacuum, we then show that the detector’s response to an UDW particle detector coupled linearly to the scalar density of a massless Dirac field in the spatially flat FRW spacetimes in d-dimensions is identical to the response of a detector coupled to the massless scalar field in the spatially flat FRW spacetimes in 2d-dimensions. Lastly, we discuss a massive scalar field in the spatially compactified (1 + 1)-dimensional FRW spacetime. There, the issue of the conformal zero momentum mode arises. To resolve this issue, we develop a new scheme for quantizing the conformal zero-mode. This new quantization scheme introduces a family of two real parameters for every zero-momentum mode with an associated two-real-parameter set of in/out vacua. We then show that the zero momentum initial state’s wave functional corresponds to a two-real parameter set of Gaussian wave packets. For applications, we examine the finite-time detector’s response to a massive scalar field in the (1 + 1)-dimensional, spatially compactified Milne spacetime. Explicit analytic results are obtained for the comoving and inertially non-comoving trajectories. Numerical results are provided for the comoving trajectory. The numerical results suggest that when the in-vacuum is chosen to be very far from the conventional Minkowski vacuum state, then it contains particles. As result, spontaneous excitation of the comoving detector occurs.
10

Elsayed, Tarek A. [Verfasser], and Boris [Akademischer Betreuer] Fine. "Chaos and Relaxation in Classical and Quantum Spin Systems / Tarek A. Elsayed ; Betreuer: Boris Fine." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177382822/34.

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Частини книг з теми "5108 Quantum physics":

1

Manoukian, E. B. "Quantum Teleportation." In 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand, 69–70. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51081-7_10.

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Manoukian, E. B. "Perturbative Quantum Gravity." In 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand, 445–49. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51081-7_72.

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Manoukian, E. B. "Quantum Dynamics, Construction of Hamiltonians and Decay of Quantum Systems." In 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand, 39–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51081-7_5.

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Manoukian, E. B. "Schrödinger’s Cat and Quantum Decoherence." In 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand, 61–67. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51081-7_9.

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Manoukian, E. B. "Quantization of Geometry and Loop Quantum Gravity." In 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand, 439–44. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51081-7_71.

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Manoukian, E. B. "Quantum Dynamics: The Functional Differential Formalism of QFT." In 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand, 149–55. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51081-7_22.

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Manoukian, E. B. "The Five Types of Fields You Meet in Quantum Field Theory." In 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand, 105–16. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51081-7_16.

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Manoukian, E. B. "How Quantum Mechanics Forces Matter in Bulk to Occupy Such a Large Volume and Prevents It from Collapsing Around Us." In 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand, 55–59. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51081-7_8.

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