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For second harmonic generation, when restricted to one space dimension and pure amplitude modulation, we establish a direct relation between the incident pulse-shape of the fundamental wave and the asymptotic pulse-shape of the harmonic wave. In particular, we show that the inverse problem —...
When submitted to a uniform electric field, electrons in the free states of a periodic potential can exhibit oscillating motions whose period is too large for being observed in real crystals. This is not the case in quasicrystals whose very small wavelength Fourier components can produce Bloch...
In this article, we show that the three-particle Greenberger–Horne–Zeilinger states can be used to reject a class of local hidden-variables theory. A type of nonlocality proof given by Hardy is performed.
A scheme of teleporting a two-particle entangled state is proposed. In this scheme, two pairs of entangled particles are used as quantum channel. It is shown that if the two pairs of particles are not-maximally entangled, the probability of successful teleportation is determined only by the...
Here we put forward some arguments in favour of the existence of slow bars. More then a half of spiral galaxies have in their central regions a bar — a structure in the form of triaxial ellipsoid. Historically two models of the bar were developed — those of the so called “slow” and...
We find the exact dynamics — in mean value — for a one-dimensional tight-binding particle in presence of a dynamical impurity (dichotomic process). Our results can be interpreted in terms of a “quasi-particle”, representing the excitation of the system interacting with its surrounding....
Correlation between electron heat diffusivity and short wavelength ( kρ i ∼5) fluctuation amplitude was observed in the TFTR tokamak in the core of ERS plasmas (Phys. Lett. A 236 (1997) 339). These fluctuations propagate in the ion diamagnetic drift direction with wave number comparable to ω...
We explore the applicability of the exact renormalization group to the study of tunnelling phenomena. We investigate quantum-mechanical systems whose energy eigenstates are affected significantly by tunnelling through a barrier in the potential. Within the approximation of the derivative...
Astrophysical jets are modelled by the exact axially symmetric equilibria of plasma in the gravitational field of an attracting center. The derived solutions have an arbitrary constant partition between the plasma magnetic and kinetic energy and generalize the Chandrasekhar equipartition...
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