N-port rectangular-shaped distributed RC NETWORKS

Dielectric material between resistive thin film and pure conductor considered as n-port distributed RC networ

Preliminary lattice study of σ\sigma meson decay width

We report an exploratory lattice investigation of $\sigma$ meson decay width using s-wave scattering phase for isospin I=0 pion-pion ($\pi\pi$) system. Rummukainen-Gottlieb formula is used to estimate the scattering phase, which demonstrate the presence of a resonance around $\sigma$ meson. Using the effective range formula we extract the effective $\sigma \to \pi\pi$ coupling constant as $g_{\sigma \pi\pi} = 2.69(44)$ GeV, which is consistent with theoretical predictions. The estimated decay width is about $236 \pm 49$ MeV. These simulations are carried out on a $16^3\times48$ MILC gauge configuration with the $N_f=2+1$ flavor of the "Asqtad" improved staggered dynamical sea quarks at $m_\pi / m_\sigma \approx 0.414$ and the lattice spacing $a \approx 0.15$ fm.Comment: Remove some typos and make it concise and easily understan

Studying κ\kappa meson with a MILC fine lattice

Using the lattice simulations in the Asqtad-improved staggered fermion formulation we compute the point-to-point $\kappa$ correlators, which are analyzed by the rooted staggered chiral perturbation theory (rS$\chi$PT). After chiral extrapolation, we secure the physical $\kappa$ mass with $835\pm93$ MeV, which is in agreement with the BES experimental results. The computations are performed using a MILC 2+1 flavor fine gauge configuration at a lattice spacing of $a \approx 0.09$ fm.Comment: Remove some typo

Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3

CuxBi2Se3 was recently proposed as a promising candidate for time-reversal-invariant topological superconductors[1]. In this work, we argue that the unusual anisotropy of the Knight shift observed by Zheng[2], taken together with specific heat measurements, provides strong support for an unconventional odd-parity pairing in the two-dimensional E_u representation of the D3d crystal point group[1], which spontaneously breaks the three-fold rotational symmetry of the crystal, leading to a subsidiary nematic order. We predict that the spin-orbit interaction associated with hexagonal warping plays a crucial role in pinning the two-component order parameter and makes the superconducting state fully-gapped, leading to a topological superconductor. Experimental signatures of the E_u pairing related to the nematic order are discussed.Comment: accepted by Phys. Rev. B Rapid Communicatio