17,667 research outputs found
The Coester Line in Relativistic Mean Field Nuclear Matter
The Walecka model contains essentially two parameters that are associated
with the Lorentz scalar (S) and vector (V) interactions. These parameters are
related to a two-body interaction consisting of S and V, imposing the condition
that the two-body binding energy is fixed. We have obtained a set of different
values for the nuclear matter binding energies at equilibrium densities. We
investigated the existence of a linear correlation between and ,
claimed to be universal for nonrelativistic systems and usually known as the
Coester line, and found an approximate linear correlation only if remains
constant. It is shown that the relativistic content of the model, which is
related to the strength of , is responsible for the shift of the Coester
line to the empirical region of nuclear matter saturation.Comment: 7 pages, 5 figure
Polarized currents and spatial separation of Kondo state: NRG study of spin-orbital effect in a double QD
A double quantum dot device, connected to two channels that only see each
other through interdot Coulomb repulsion, is analyzed using the numerical
renormalization group technique. By using a two-impurity Anderson model, and
parameter values obtained from experiment [S. Amasha {\it et al.}, Phys. Rev.
Lett. {\bf 110}, 046604 (2013)], it is shown that, by applying a moderate
magnetic field, and adjusting the gate potential of each quantum dot, opposing
spin polarizations are created in each channel. Furthermore, through a well
defined change in the gate potentials, the polarizations can be reversed. This
polarization effect is clearly associated to a spin-orbital Kondo state having
a Kondo peak that originates from spatially separated parts of the device. This
fact opens the exciting possibility of experimentally probing the internal
structure of an SU(2) Kondo state.Comment: 4+ pages; 4 figures; supplemental material (1 page, 2 figures
- …