16,867 research outputs found
Weak measurements of a large spin angular splitting of light beam on reflection at Brewster angle
We reveal a large spin angular splitting of light beam on reflection at the
Brewster angle both theoretically and experimentally. A simple weak
measurements system manifesting itself for the built-in post-selection
technique is proposed to explore this angular splitting. Remarkably, the
directions of the spin accumulations can be switched by adjusting the initial
handedness of polarization.Comment: 7 pages, 4 figure
Optimizing Hartree-Fock orbitals by the density-matrix renormalization group
We have proposed a density-matrix renormalization group (DMRG) scheme to
optimize the one-electron basis states of molecules. It improves significantly
the accuracy and efficiency of the DMRG in the study of quantum chemistry or
other many-fermion system with nonlocal interactions. For a water molecule, we
find that the ground state energy obtained by the DMRG with only 61 optimized
orbitals already reaches the accuracy of best quantum Monte Carlo calculation
with 92 orbitals.Comment: published version, 4 pages, 4 figure
Fabrication of nanostructured pearlite steel wires using electropulsing
This work reports the refinement of pearlite structure into nanostructure using electropulsing. Nanostructured pearlitic steel wires possess nanoscale lamellae or nanoscale grain microstructures. Fabrication of nanostructures by severe plastic deformation and lamellar to grain transformation have been investigated. It is suggested that an aligned pearlite structure is preferred in severe plastic deformation. The lamellar to grain transformation is controlled by diffusion of carbon within cementite and also from cementite to ferrite phases. Carbon mobility is changed by mechanical, thermal and electrical states. The interface between nanoscale sub-grains in the ferrite phase has considerable carbon content. Numerical calculations and experimental observations demonstrated these mechanisms
Heavy and light flavor jet quenching at RHIC and LHC energies
The Linear Boltzmann Transport (LBT) model coupled to hydrodynamical
background is extended to include transport of both light partons and heavy
quarks through the quark-gluon plasma (QGP) in high-energy heavy-ion
collisions. The LBT model includes both elastic and inelastic
medium-interaction of both primary jet shower partons and thermal recoil
partons within perturbative QCD (pQCD). It is shown to simultaneously describe
the experimental data on heavy and light flavor hadron suppression in
high-energy heavy-ion collisions for different centralities at RHIC and LHC
energies. More detailed investigations within the LBT model illustrate the
importance of both initial parton spectra and the shapes of fragmentation
functions on the difference between the nuclear modifications of light and
heavy flavor hadrons. The dependence of the jet quenching parameter
on medium temperature and jet flavor is quantitatively extracted.Comment: 6 pages, 6 figure
- …