Papers by doru baltateanu
Journal of Materials Processing Technology, 2005
We report a new possibility of obtaining silicon carbide (SiC) using the glow-discharge electron ... more We report a new possibility of obtaining silicon carbide (SiC) using the glow-discharge electron gun. The melting installation, the powder pellet preparation procedures as well as the experimental results together with the crystallographic analysis for the raw material and the obtained silicon carbide are presented.
International Journal of Modern Physics B, 2016
The relativistic theory of the Dirac fermions moving on cylinders in external Aharonov–Bohm (AB) ... more The relativistic theory of the Dirac fermions moving on cylinders in external Aharonov–Bohm (AB) field is built starting with a suitably restricted Dirac equation whose spin degrees of freedom are not affected. The exact solutions of this equation on finite or infinite AB cylinders allow one to derive the relativistic circular and longitudinal currents pointing out their principal features. It is shown that all the circular currents are related to the energy in the same manner on cylinders or rings either in the relativistic approach or in the nonrelativistic one. The specific relativistic effect is the saturation of the circular currents for high values of the total angular momentum. Based on this property some approximative closed formulas are deduced for the total persistent current at [Formula: see text] on finite AB cylinders. Moreover, it is shown that all the persistent currents on finite cylinders or rings have similar nonrelativistic limits.
Modern Physics Letters A, 2015
In this paper, it is shown that the covariant representation (CR) transforming the Dirac field un... more In this paper, it is shown that the covariant representation (CR) transforming the Dirac field under de Sitter isometries is equivalent to a direct sum of two unitary irreducible representations (UIRs) of the Sp(2, 2) group transforming alike the particle and antiparticle field operators in momentum representation. Their basis generators and Casimir operators are written down for the first time finding that these representations are equivalent to an UIR from the principal series whose canonical labels are determined by the fermion mass and spin. The properties of the conserved observables (i.e. one-particle operators) associated to the de Sitter isometries via Noether theorem and of the corresponding Pauli–Lubanski type operator are also pointed out.
International Journal of Modern Physics B, 2016
The exact solutions of the complete Dirac equation for fermions moving in ideal Aharonov–Bohm rin... more The exact solutions of the complete Dirac equation for fermions moving in ideal Aharonov–Bohm rings are used for deriving the exact expressions of the relativistic partial currents. It is shown that as in the nonrelativistic case, these currents can be related to the derivative of the fermion energy with respect to the flux parameter. A specific relativistic effect is the saturation of the partial currents for high values of the total angular momentum. Based on this property, the total relativistic persistent current at T = 0 is evaluated giving its analytical expression and showing how this depends on the ring parameters.
Physics Letters A, 2013
ABSTRACT The Letter deals with the transport of relativistic electron through a quantum heterostr... more ABSTRACT The Letter deals with the transport of relativistic electron through a quantum heterostructure in the presence of a constant bias voltage. The transmission coefficient associated to the relativistic moving through the considered system is computed using the transfer matrix formalism for piecewise constant potentials. The results are compared to those which correspond to the non-relativistic case, in which the Schrödinger equation is used. The comparison is performed for different values of the system length and the effect of the bias voltage is also studied.
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Papers by doru baltateanu