10,864 research outputs found
Graphene tests of Klein phenomena
Graphene is characterized by chiral electronic excitations. As such it
provides a perfect testing ground for the production of Klein pairs
(electron/holes). If confirmed, the standard results for barrier phenomena must
be reconsidered with, as a byproduct, the accumulation within the barrier of
holes.Comment: 8 page
Resonance, multiple diffusion and critical tunneling for Gaussian lasers
We present a detailed study of the gaussian laser propagation through a
dielectric system composed by two right angle prisms. We investigate the
transition between the spatial coherence limit, which exhibits wave-like
properties and for which the resonance phenomenon can be seen, and the
decoherence limit, which exhibits particle-like properties and for which the
multiple diffusion occurs. We also analyze the tunneling at critical angles. In
our numerical analysis, we shall use BK7 and Fused Silica prisms and a gaussian
He-Ne laser with a wavelength of 632.8 nm and beam waists of 2 mm and 200
micron.Comment: 18 pages, 3 tables, 5 figure
The use of the stationary phase method as a mathematical tool to determine the path of optical beams
We use the stationary phase method to determine the path of optical beams
which propagate through a dielectric block. In the presence of partial internal
reflection, we recover the geometrical result obtained by using the Snell law.
For total internal reflection, the stationary phase method overreaches the
Snell law predicting the Goos-Haenchen shift.Comment: 11 pages, 2 figure
Quaternionic potentials in non-relativistic quantum mechanics
We discuss the Schrodinger equation in presence of quaternionic potentials.
The study is performed analytically as long as it proves possible, when not, we
resort to numerical calculations. The results obtained could be useful to
investigate an underlying quaternionic quantum dynamics in particle physics.
Experimental tests and proposals to observe quaternionic quantum effects by
neutron interferometry are briefly reviewed.Comment: 21 pages, 16 figures (ps), AMS-Te
Quaternionic eigenvalue problem
We discuss the (right) eigenvalue equation for , and
linear quaternionic operators. The possibility to introduce an
isomorphism between these operators and real/complex matrices allows to
translate the quaternionic problem into an {\em equivalent} real or complex
counterpart. Interesting applications are found in solving differential
equations within quaternionic formulations of quantum mechanics.Comment: 13 pages, AMS-Te
Study to determine suitable high temperature, high altitude, total temperature sensors Final report
High temperature, high altitude total temperature sensor development - thermocouple devic
Potential Scattering in Dirac Field Theory
We develop the potential scattering of a spinor within the context of
perturbation field theory. As an application, we reproduce, up to second order
in the potential, the diffusion results for a potential barrier of quantum
mechanics. An immediate consequence is a simple generalization to arbitrary
potential forms, a feature not possible in quantum mechanics.Comment: 7 page
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