5,734 research outputs found
Origin of the anapole condition as revealed by a simple expansion beyond the toroidal multipole
Toroidal multipoles are a topic of increasing interest in the nanophotonics
and metamaterials communities. In this paper, we separate out the toroidal
multipole components of multipole expansions in polar coordinates (two- and
three-dimensional) by expanding the Bessel or spherical Bessel functions. We
discuss the formation of the lowest order of magnetic anapoles from the
interaction between the magnetic toroidal dipole and the magnetic dipole. Our
method also reveals that there are higher order current configurations other
than the electric toroidal multipole that have the same radiation
characteristics as the pure electric dipole. Furthermore, we find that the
anapole condition requires that there is a perfect cancellation of all higher
order current configurations
Unified parametrization of quark and lepton mixing matrices in tri-bimaximal pattern
Parametrization of the quark and lepton mixing matrices is the first attempt
to understand the mixing of fermions. In this work, we parameterize the quark
and lepton matrices with the help of quark-lepton complementarity (QLC) in a
tri-bimaximal pattern of lepton mixing matrix. In this way, we combine the
parametrization of the two matrices with each other. We apply this new
parametrization to several physical quantities, and show its simplicity in the
expression of, e.g., the Jarlskog parameter of CP violation.Comment: 12 latex page
Contribution of Continuum in the QCD Sum Rule for
Using the soft-pion theorem and the assumption on the final-state
interactions, we include the contribution of continuum into the QCD sum
rules for meson. We find that this contribution can
significantly lower the mass and the decay constant of state. For
the value of the current quark mass , we obtain the
mass of in the interval , being in agreement with the experimental data, and the vector
current decay constant of , much
lower than those obtained in previous literature
Is there a finite mobility for the one vibrational mode Holstein model? Implications from real time simulations
The question of whether there exists a finite mobility in the standard
Holstein model with one vibrational mode on each site remains unclear. In this
letter, we approach this problem by employing the hierarchical equation of
motion (HEOM) method to simulate model systems where the vibrational modes are
dissipative. It is found that, as the friction becomes smaller, the charge
carrier mobility increases significantly and a friction free limit can not be
obtained. The current autocorrelation functions are also calculated for the
friction free Holstein model, and converged results can not be obtained with
the increase of the number of sites. Based on these observations, we conclude
that a finite mobility can not be defined for the standard Holstein model,
which is consistent with the recent finding by Kolss {\it et al.} (Phys. Rev.
Lett. 123, 126601)
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