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Search Results: 1 - 10 of 32975 matches for " Martínez-Mares "
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Scattering matrix of elliptically polarized waves
Martínez-Mares, M.;Casta?o, E;
Revista mexicana de física E , 2010,
Abstract: we analyze the scattering of elliptically polarized plane waves normally incident at the planar interface between two different materials; we consider two cases: dielectric-dielectric and dielectric-conductor interfaces. the scattering s matrix in both cases is obtained using the boundary conditions and poynting's theorem. in the dielectric-dielectric case we write s using two different basis, the usual xy and a rotated one. for the dielectric-conductor interface, the use of the rotated basis together with an energy balance argument leads us, in a natural way, to construct a unitary s matrix after recognizing the need to introduce two equivalent parasitic channels due to dissipation in the conductor, and the transmission coefficient into these parasitic channels measures the absorption strength.
Scattering matrix of elliptically polarized waves
M. Martínez-Mares,E Casta?o
Revista mexicana de física E , 2010,
Abstract: We analyze the scattering of elliptically polarized plane waves normally incident at the planar interface between two different materials; we consider two cases: dielectric-dielectric and dielectric-conductor interfaces. The scattering S matrix in both cases is obtained using the boundary conditions and Poynting's theorem. In the dielectric-dielectric case we write S using two different basis, the usual xy and a rotated one. For the dielectric-conductor interface, the use of the rotated basis together with an energy balance argument leads us, in a natural way, to construct a unitary S matrix after recognizing the need to introduce two equivalent parasitic channels due to dissipation in the conductor, and the transmission coefficient into these parasitic channels measures the absorption strength. Analizamos la dispersión de ondas electromagnéticas que inciden normalmente sobre una interfaz plana entre dos diferentes materiales; consideramos dos casos: interfaz dieléctrico-dieléctrico e interfaz -dieléctrico-conductor. En ambos casos obtenemos la matriz S al usar las condiciones de frontera y el teorema de Poynting. En el caso dieléctrico-dieléctrico escribimos a S usando dos diferentes bases, la usual xy y una rotada. Para la interfaz dieléctrico-conductor, el usar la base rotada junto con un argumento de balance de energía nos lleva, de manera natural, a construir un matriz S que es unitaria después de reconocer la necesidad de introducir dos canales parasíticos, equivalentes entre sí, que son debidos a la disipación en el conductor, siendo el coeficiente de transmisión hacia estos canales parasíticos la medida de la capacidad de absorción del conductor mismo.
Scattering matrix of elliptically polarized waves
M. Martínez-Mares,E. Casta?o
Physics , 2011,
Abstract: We analyze the scattering of elliptically polarized plane waves normally incident at the planar interface between two different materials; we consider two cases: dielectric-dielectric and dielectric-conductor interfaces. The scattering matrix S in both cases is obtained using the boundary conditions and Poynting's theorem. In the dielectric-dielectric case we write S using two different basis, the usual xy and a rotated one. For the dielectric-conductor interface, the use of the rotated basis together with an energy balance argument leads us, in a natural way, to construct a unitary S matrix after recognizing the need to introduce two equivalent parasitic channels due to dissipation in the conductor, and the transmission coefficient into these parasitic channels measures the absorption strength.
Random matrix study for a three-terminal chaotic device
A. M. Martínez-Argüello,E. Casta?o,M. Martínez-Mares
Physics , 2014, DOI: 10.1063/1.4862416
Abstract: We perform a study based on a random-matrix theory simulation for a three-terminal device, consisting of chaotic cavities on each terminal. We analyze the voltage drop along one wire with two chaotic mesoscopic cavities, connected by a perfect conductor, or waveguide, with one open mode. This is done by means of a probe, which also consists of a chaotic cavity that measure the voltage in different configurations. Our results show significant differences with respect to the disordered case, previously considered in the literature.
M?bius transformations and electronic transport properties of large disorderless networks
Yu Jiang,M. Martínez-Mares,E. Casta?o,A. Robledo
Physics , 2011, DOI: 10.1103/PhysRevE.85.057202
Abstract: We show that the key transport states, insulating and conducting, of large regular networks of scatterers can be described generically by negative and zero Lyapunov exponents, respectively, of M\"obius maps that relate the scattering matrix of systems with successive sizes. The conductive phase is represented by weakly chaotic attractors that have been linked with anomalous transport and ergodicity breaking. Our conclusions, verified for serial as well as parallel stub and ring structures, reveal that mesoscopic behavior results from a drastic reduction of degrees of freedom.
Absorption and Direct Processes in Chaotic Wave Scattering
R. A. Méndez-Sánchez,G. Báez,M. Martínez-Mares
Physics , 2011, DOI: 10.1063/1.3536616
Abstract: Recent results on the scattering of waves by chaotic systems with losses and direct processes are discussed. We start by showing the results without direct processes nor absorption. We then discuss systems with direct processes and lossy systems separately. Finally the discussion of systems with both direct processes and loses is given. We will see how the regimes of strong and weak absorption are modified by the presence of the direct processes.
Delay times in chaotic quantum systems
A. M. Martínez-Argüello,A. A. Fernández-Marín,M. Martínez-Mares
Physics , 2015,
Abstract: By an inductive reasoning, and based on recent results of the joint moments of proper delay times of open chaotic systems for ideal coupling to leads, we obtain a general expression for the distribution of the partial delay times for an arbitrary number of channels and any symmetry. This distribution was not completely known for all symmetry classes. Our theoretical distribution is verified by random matrix theory simulations of ballistic chaotic cavities.
Wave systems with direct processes and localized losses or gains: the non-unitary Poisson kernel
A. M. Martínez-Argüello,R. A. Méndez-Sánchez,M. Martínez-Mares
Physics , 2012, DOI: 10.1103/PhysRevE.86.016207
Abstract: We study the scattering of waves in systems with losses or gains simulated by imaginary potentials. This is done for a complex delta potential that corresponds to a spatially localized absorption or amplification. In the Argand plane the scattering matrix moves on a circle $C$ centered on the real axis, but not at the origin, that is tangent to the unit circle. From the numerical simulations it is concluded that the distribution of the scattering matrix, when measured from the center of the circle $C$, agrees with the non-unitary Poisson kernel. This result is also obtained analytically by extending the analyticity condition, of unitary scattering matrices, to the non-unitary ones. We use this non-unitary Poisson kernel to obtain the distribution of non-unitary scattering matrices when measured from the origin of the Argand plane. The obtained marginal distributions have an excellent agreement with the numerical results.
Joint moments of proper delay times
Angel M. Mart\'\inez-Argüello,Moisés Martínez-Mares,Julio C. García
Mathematics , 2014, DOI: 10.1063/1.4890559
Abstract: We calculate negative moments of the $N$-dimensional Laguerre distribution for the orthogonal, unitary, and symplectic symmetries. These moments correspond to those of the proper delay times, which are needed to determine the statistical fluctuations of several transport properties through classically chaotic cavities, like quantum dots and microwave cavities with ideal coupling.
On the Ergodicity of a semi-infinite one-dimensional periodic potential
V. Domínguez-Rocha,R. A. Méndez-Sánchez,M. Martínez-Mares
Physics , 2015,
Abstract: In this work we study the ergodicity on a linear chain. We build an ensemble whose elements are ordered linear chains. Each element is composed of a different number of scatterers. With a recursive relation all the elements are related between them, and it is possible to build the ensemble. When the number of scatterers becomes infinite an analytic solution is developed. This solution is the ensemble average, which gives a perfect fit with the kernel of Poisson at fixed energy. Also this solution gives the energy average for a fixed number of scatterers and energy variable.
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