8 research outputs found
Non-linear doublon production in a Mott insulator --- Landau-Dykhne method applied to an integrable model
Doublon-hole pair production which takes place during dielectric breakdown in
a Mott insulator subject to a strong laser or a static electric field is
studied in the one-dimensional Hubbard model. Two nonlinear effects cause the
excitation, i.e., multi-photon absorption and quantum tunneling. Keldysh
crossover between the two mechanisms occurs as the field strength and photon
energy is changed. The calculation is done analytically by the Landau-Dykhne
method in combination with the Bethe ansatz solution and the results are
compared with those of the time dependent density matrix renormalization group.
Using this method, we calculate distribution function of the generated
doublon-hole pairs and show that it drastically changes as we cross the Keldysh
crossover line. After calculating the tunneling threshold for several
representative one-dimensional Mott insulators, possible experimental tests of
the theory is proposed such as angle resolved photoemission spectroscopy of the
upper Hubbard band in the quantum tunneling regime. We also discuss the
relation of the present theory with a many-body extension of electron-positron
pair production in nonlinear quantum electrodynamics known as the Schwinger
mechanism.Comment: 15 page
Multipole Amplitudes of Pion Photoproduction on Nucleons up to 2GeV within Dispersion Relations and Unitary Isobar Model
Two approaches for analysis of pion photo- and electroproduction on nucleons
in the resonance energy region are checked at using the results of
GWU(VPI) partial-wave analysis of photoproduction data. The approaches are
based on dispersion relations and unitary isobar model. Within dispersion
relations good description of photoproduction multipoles is obtained up to
. Within unitary isobar model, modified with increasing energy by
incorporation of Regge poles, and with unified Breit-Wigner parametrization of
resonance contributions, good description of photoproduction multipoles is
obtained up to .Comment: 23 pages, LaTe
Vector meson production and nucleon resonance analysis in a coupled-channel approach for energies m_N < sqrt(s) < 2 GeV II: photon-induced results
We present a nucleon resonance analysis by simultaneously considering all
pion- and photon-induced experimental data on the final states gamma N, pi N, 2
pi N, eta N, K Lambda, K Sigma, and omega N for energies from the nucleon mass
up to sqrt(s) = 2 GeV. In this analysis we find strong evidence for the
resonances P_{31}(1750), P_{13}(1900), P_{33}(1920), and D_{13}(1950). The
omega N production mechanism is dominated by large P_{11}(1710) and
P_{13}(1900) contributions. In this second part we present the results on the
photoproduction reactions and the electromagnetic properties of the resonances.
The inclusion of all important final states up to sqrt(s) = 2 GeV allows for
estimates on the importance of the individual states for the GDH sum rule.Comment: 41 pages, 26 figures, discussion extended, typos corrected,
references updated, to appear in Phys. Rev.
P-wave excited baryons from pion- and photo-induced hyperon production
We report evidence for , , ,
, , and , and find
indications that might have a companion state at 1970\,MeV. The
controversial is not seen. The evidence is derived from a
study of data on pion- and photo-induced hyperon production, but other data are
included as well. Most of the resonances reported here were found in the
Karlsruhe-Helsinki (KH84) and the Carnegie-Mellon (CM) analyses but were
challenged recently by the Data Analysis Center at GWU. Our analysis is
constrained by the energy independent scattering amplitudes from either
KH84 or GWU. The two amplitudes from KH84 or GWU, respectively, lead to
slightly different branching ratios of contributing resonances but the
debated resonances are required in both series of fits.Comment: 22 pages, 28 figures. Some additional sets of data are adde
Delta-to-N-gamma Coulomb Quadrupole Amplitude in PQCD
We present a leading-order pQCD calculation of the helicity-flip matrix element (Coulomb quadrupole amplitude ), taking
into account the transverse momenta of the quarks and the contribution from the
gluons. In the large limit, its scaling behavior acquires a
double-logarithmic correction compared with the
standard scaling analysis, due to the contribution from the orbital motion of
the small- partons. Based on this and on the latest JLab experimental
results of the ratio at = 3 4 GeV, we make a
phenomenological prediction for the latter at higher values of .Comment: 9 pages, two figure