1,963 research outputs found
Meson and Baryon dispersion relations with Brillouin fermions
We study the dispersion relations of mesons and baryons built from Brillouin
quarks on one N_f=2 gauge ensemble provided by QCDSF. For quark masses up to
the physical strange quark mass, there is hardly any improvement over the
Wilson discretization, if either action is link-smeared and tree-level clover
improved. For quark masses in the range of the physical charm quark mass, the
Brillouin action still shows a perfect relativistic behavior, while the Wilson
action induces severe cut-off effects. As an application we determine the
masses of the \Omega_c^0, \Omega_{cc}^+ and \Omega_{ccc}^{++} baryons on that
ensemble.Comment: 16 pages, 9 figures, 4 tables; v2: one Reference added, matches
published versio
Training Induced Positive Exchange Bias in NiFe/IrMn Bilayers
Positive exchange bias has been observed in the
NiFe/IrMn bilayer system via soft x-ray resonant
magnetic scattering. After field cooling of the system through the blocking
temperature of the antiferromagnet, an initial conventional negative exchange
bias is removed after training i. e. successive magnetization reversals,
resulting in a positive exchange bias for a temperature range down to 30 K
below the blocking temperature (450 K). This new manifestation of magnetic
training is discussed in terms of metastable magnetic disorder at the
magnetically frustrated interface during magnetization reversal.Comment: 4 pages, 3 figure
Femtosecond x-ray absorption spectroscopy of spin and orbital angular momentum in photoexcited Ni films during ultrafast demagnetization
We follow for the first time the evolution of the spin and orbital angular
momentum of a thin Ni film during ultrafast demagnetization, by means of x-ray
magnetic circular dichroism. Both components decrease with a 130 +/- 40 fs time
constant upon excitation with a femtosecond laser pulse. Additional x-ray
absorption measurements reveal an increase in the spin-orbit interaction by 6
+/- 2 % during this process. This is the experimental demonstration quantifying
the importance of spin-orbit mediated processes during the demagnetization
Melt viscosities of lattice polymers using a Kramers potential treatment
Kramers relaxation times and relaxation times and
for the end-to-end distances and for center of mass diffusion are
calculated for dense systems of athermal lattice chains. is defined
from the response of the radius of gyration to a Kramers potential which
approximately describes the effect of a stationary shear flow. It is shown that
within an intermediate range of chain lengths N the relaxation times
and exhibit the same scaling with N, suggesting that N-dependent
melt-viscosities for non-entangled chains can be obtained from the Kramers
equilibrium concept.Comment: submitted to: Journal of Chemical Physic
Rate of decoherence for an electron weakly coupled to a phonon gas
We study the dynamics of an electron weakly coupled to a phonon gas. The
initial state of the electron is the superposition of two spatially localized
distant bumps moving towards each other, and the phonons are in a thermal
state. We investigate the dynamics of the system in the kinetic regime and show
that the time evolution makes the non-diagonal terms of the density matrix of
the electron decay, destroying the interference between the two bumps. We show
that such a damping effect is exponential in time, and the related decay rate
is proportional to the total scattering cross section of the electron-phonon
interaction.Comment: 27 pages, 2 figure
Opposite Arrows of Time Can Reconcile Relativity and Nonlocality
We present a quantum model for the motion of N point particles, implying
nonlocal (i.e., superluminal) influences of external fields on the
trajectories, that is nonetheless fully relativistic. In contrast to other
models that have been proposed, this one involves no additional space-time
structure as would be provided by a (possibly dynamical) foliation of
space-time. This is achieved through the interplay of opposite microcausal and
macrocausal (i.e., thermodynamic) arrows of time.Comment: 12 pages, 4 figures; v5: section headlines adde
Dispersion relation and spectral range of Karsten-Wilczek and Borici-Creutz fermions
We investigate some properties of Karsten-Wilczek and Borici-Creutz fermions,
which are the best known varieties in the class of minimally doubled lattice
fermion actions. Our focus is on the dispersion relation and the distribution
of eigenvalues in the free-field theory. We consider the situation in two and
four space-time dimensions, and we discuss how properties vary as a function of
the Wilson-like lifting parameter .Comment: 41 pages, 16 figures, 5 appendices; v2: enhanced discussion, 6
additional references, typo in caption of Fig.6 fixe
Topological properties of minimally doubled fermions in two space-time dimensions
The two-dimensional Schwinger model is used to explore how lattice fermion
operators perceive the global topological charge of a given
background gauge field. We focus on Karsten-Wilczek and Borici-Creutz fermions,
which are minimally doubled, and compare them to Wilson, Brillouin, naive,
staggered and Adams fermions. For each operator the eigenvalue spectrum in a
background with is determined along with the chiralities of the
eigenmodes, and the spectral flow of the pertinent hermitean operator is worked
out. We find that Karsten-Wilczek and Borici-Creutz fermions perceive the
global topological charge in the same way as staggered and naive fermions
do.Comment: 32 pages, 31 figures with 68 panel
Manifestation of fundamental quantum complementarities in time-domain interference experiments with quantum dots: A theoretical analysis
A theoretical analysis is presented showing that fundamental complementarity
between the particle-like properties of an exciton confined in a semiconductor
quantum dot and the ability of the same system to show interference may be
studied in a time domain interference experiment, similar to those currently
performed. The feasibility of such an experiment, including required pulse
parameters and the dephasing effect of the environment, is studied.Comment: Final, considerably extended version; 8 pages, 3 figure
- …