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Huerta L.,University of Talca | Huerta L.,P4 Center for Research and Applications in Plasma Physics and Pulsed Power Technology
Journal of Physics: Conference Series | Year: 2016

Chern-Simons (CS) systems interacting with electromagnetic radiation are described by a term f FF added to the Maxwell action. In (3+1)D, this CS term is a boundary term affecting the system behaviour in its borders. We study the consequences of the above in the properties of electromagnetic radiation, in particular, by considering the interplay between magneto-electric properties and topology. Apart from a modified Kerr polarization rotation, compared to that found for the particular case of topological insulators, we also found two Brewster angles, for s and p polarization of reflected radiation, respectively. Energy distribution between reflected and transmitted radiation is also studied in terms of the magneto-electric properties and topological condition of the system. © Published under licence by IOP Publishing Ltd. Source


Huerta L.,University of Talca | Huerta L.,P4 Center for Research and Applications in Plasma Physics and Pulsed Power Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

Chern-Simons (CS) θ-systems are described by a θ∫FF term in the action (θ is an adimensional parameter), which does not change field equations in the bulk, but affects the system behavior when it is bounded. When two of those θ-systems, each one characterized by a different value of θ (even zero), share a common boundary, surface effects are then induced by a CS θ term. Here, we study the consequences of the above in the propagation of electromagnetic radiation in θ-systems. In a previous paper, electromagnetic radiation properties traversing a θ-vacuum were analyzed, where a number of interesting features arise related to polarization and energy distribution. Now, we investigate how electric and magnetic properties of the θ-system affect the optical response. Apart from the well-known Kerr polarization rotation found for the particular case of topological insulators, we examine in detail the issue, and the results could be applied in other contexts where the θ term accounts for the system dynamics. In particular, we find two different Brewster angles, for s and p polarization of reflected radiation, respectively, with peculiar features derived from the θ term influence. Possible applications of these results are discussed. © 2014 American Physical Society. Source


Huerta L.,University of Talca | Huerta L.,P4 Center for Research and Applications in Plasma Physics and Pulsed Power Technology | Zanelli J.,Andres Bello University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

Chern-Simons (CS) forms generalize the minimal coupling between gauge potentials and point charges to sources represented by charged extended objects (branes). The simplest example of such a CS-brane coupling is a domain wall coupled to the electromagnetic CS three-form. This describes a topologically charged interface where the CS form A°dA is supported, separating two three-dimensional spatial regions in 3+1 spacetime. Electrodynamics at either side of the brane is described by the same Maxwell's equations, but those two regions have different vacua characterized by a different value of the θ-parameter multiplying the Pontryagin form F°F. The θ-term is the Abelian version of the concept introduced by 't Hooft for the resolution of the U(1) problem in QCD. We point out that CS-generalized classical electrodynamics show new phenomena when two neighboring regions with different θ-vacua are present. These topological effects result from surface effects induced by the boundary, and we explore the consequences of such boundary effects for the propagation of the electromagnetic field in Maxwell theory. Several features including optical and electrostatic/magnetostatic responses, which may be observable in condensed matter systems like topological insulators, are discussed. © 2012 American Physical Society. Source

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