159,808 research outputs found
Spin-dependent Fano resonance induced by conducting chiral helimagnet contained in a quasi-one-dimensional electron waveguide
Fano resonance appears for conduction through an electron waveguide
containing donor impurities. In this work, we consider the thin-film conducting
chiral helimagnet (CCH) as the donor impurity in a one-dimensional waveguide
model. Due to the spin spiral coupling, interference between the direct and
intersubband transmission channels gives rise to spin-dependent Fano resonance
effect. The spin-dependent Fano resonance is sensitively dependent on the
helicity of the spiral. By tuning the CCH potential well depth and the incident
energy, this provides a potential way to detect the spin structure in the CCH.Comment: 14 pages, 6 figure
The stochastic reflection problem on an infinite dimensional convex set and BV functions in a Gelfand triple
In this paper, we introduce a definition of BV functions in a Gelfand triple
which is an extension of the definition of BV functions in [2] by using
Dirichlet form theory. By this definition, we can consider the stochastic
reflection problem associated with a self-adjoint operator and a
cylindrical Wiener process on a convex set in a Hilbert space . We
prove the existence and uniqueness of a strong solution of this problem when
is a regular convex set. The result is also extended to the
non-symmetric case. Finally, we extend our results to the case when
, where
Systematic analysis of hadron spectra in p+p collisions using Tsallis distribution
Using the experimental data from the STAR, PHENIX, ALICE and CMS programs on
the rapidity and energy dependence of the spectra in p+p collisions, we
show that a universal distribution exists. The energy dependence of temperature
and parameter of the Tsallis distribution are also discussed in detail.
A cascade particle production mechanism in p+p collisions is proposed.Comment: 13 pages, 8 figure
On the spectral distribution of kernel matrices related to\ud radial basis functions
This paper focuses on the spectral distribution of kernel matrices related to radial basis functions. The asymptotic behaviour of eigenvalues of kernel matrices related to radial basis functions with different smoothness are studied. These results are obtained by estimated the coefficients of an orthogonal expansion of the underlying kernel function. Beside many other results, we prove that there are exactly (k+d−1/d-1) eigenvalues in the same order for analytic separable kernel functions like the Gaussian in Rd. This gives theoretical support for how to choose the diagonal scaling matrix in the RBF-QR method (Fornberg et al, SIAM J. Sci. Comput. (33), 2011) which can stably compute Gaussian radial basis function interpolants
Quench Dynamics of Entanglement in an Opened Anisotropic Spin-1/2 Heisenberg Chain
The quantum entanglement dynamics of a one-dimensional spin-1/2 anisotropic
XXZ model is studied using the method of the adaptive time-dependent
density-matrix renormalization-group when two cases of quenches are performed
in the system. An anisotropic interaction quench and the maximum number of
domain walls of staggered magnetization quench are considered. The dynamics of
pairwise entanglement between the nearest two qubits in the spin chain is
investigated. The entanglement of the two-spin qubits can be created and
oscillates in both cases of the quench. The anisotropic interaction has a
strong influence on the oscillation frequency of entanglement.Comment: 13 pages, 4 figure
- …