134,570 research outputs found
A compiled catalog of rotation measures of radio point sources
We compiled a catalog of Faraday rotation measures (RMs) for 4553
extragalactic radio point sources ublished in literature. These RMs were
derived from multi-frequency polarization observations. The RM data are
compared to those in the NRAO VLA Sky Survey (NVSS) RM catalog. We reveal a
systematic uncertainty of about \,rad~m in the NVSS RM
catalog. The Galactic foreground RM is calculated through a weighted averaging
method by using the compiled RM catalog together with the NVSS RM catalog, with
careful consideration of uncertainties in the RM data. The data from the
catalog and the interface for the Galactic foreground RM calculations are
publicly available on the webpage: http://zmtt.bao.ac.cn/RM/.Comment: 17 pages, 8 figures. Published already, at
http://www.raa-journal.org/raa/index.php/raa/article/view/171
Spin-triplet s-wave local pairing induced by Hund's rule coupling
We show within the dynamical mean field theory that local multiplet
interactions such as Hund's rule coupling produce local pairing
superconductivity in the strongly correlated regime. Spin-triplet
superconductivity driven by the Hund's rule coupling emerges from the pairing
mediated by local fluctuations in pair exchange. In contrast to the
conventional spin-triplet theories, the local orbital degrees of freedom has
the anti-symmetric part of the exchange symmetry, leaving the spatial part as
fully gapped and symmetric s-wave.Comment: 9 pages, 7 figure
Nonequilibrium electron transport in strongly correlated molecular junctions
We investigate models of molecular junctions which constitute minimal
Hamiltonians to account for zero-bias-anomaly and the satellite features of
inelastic transport by molecular phonons. Through nonlinear transport
calculations with the imaginary-time nonequilibrium formalism, a HOMO-LUMO
model with Anderson-Holstein interaction is shown to produce co-tunneling
conductance peak in the vicinity of Kondo resonance which is mediated by a
re-emergent many-body resonance assisted by phonon excitations at bias equal to
the phonon frequency. Destruction of the resonance leads to
negative-differential-resistance in the sequential tunneling regime
- …