12,154 research outputs found
The half-filled Hubbard chain in the Composite Operator Method: A comparison with Bethe Ansatz
The one-dimensional Hubbard model at half-filling is studied in the framework
of the Composite Operator Method using a static approximation. A solution
characterized by strong antiferromagnetic correlations and a gap for any
nonzero on-site interaction U is found. The corresponding ground-state energy,
double occupancy and specific heat are in excellent agreement with those
obtained within the Bethe Ansatz. These results show that the Composite
Operator Method is an appropriate framework for the half-filled Hubbard chain
and can be applied to evaluate properties, like the correlation functions,
which cannot be obtained by means of the Bethe Ansatz, except for some limiting
cases.Comment: 7 pages, 3 embedded Postscript figures, EuroTeX, submitted to
EuroPhysics Letter
Reconstructing the density operator by using generalized field quadratures
The Wigner function for one and two-mode quantum systems is explicitely
expressed in terms of the marginal distribution for the generic linearly
transformed quadratures. Then, also the density operator of those systems is
written in terms of the marginal distribution of these quadratures. Some
examples to apply this formalism, and a reduction to the usual optical homodyne
tomography are considered.Comment: 17 pages, Latex,accepted by Quantum and Semiclassical Optic
Metronomic Chemotherapy with Vinorelbine Produces Clinical Benefit and Low Toxicity in Frail Elderly Patients Affected by Advanced Non-Small Cell Lung Cancer
Lung cancer is the leading cause of death worldwide. The treatment choice for advanced stage of lung cancer may depend on histotype, performance status (PS), age, and comorbidities. In the present study, we focused on the effect of metronomic vinorelbine treatment in elderly patients with advanced unresectable non-small cell lung cancer (NSCLC). Methods. From January 2016 to December 2016, 44 patients affected by non-small cell lung cancer referred to our oncology day hospital were progressively analyzed. The patients were treated with oral vinorelbine 30 mg x 3/wk or 40 mg x 3/wk meaning one day on and one day off. The patients were older than 60, stage IIIB or IV, ECOG PS ≥ 1, and have at least one important comorbidity (renal, hepatic, or cardiovascular disease). The schedule was based on ECOG-PS and comorbidities. The primary endpoint was progression-free survival (PFS). PFS was used to compare patients based on different scheduled dosage (30 or 40 mg x3/weekly) and age (more or less than 75 years old) as exploratory analysis. We also evaluated as secondary endpoint toxicity according to Common Toxicity Criteria Version 2.0. Results. Vinorelbine showed a good safety profile at different doses taken orally and was effective in controlling cancer progression. The median overall survival (OS) was 12 months. The disease control rate (DCR) achieved 63%. The median PFS was 9 months. A significant difference in PFS was detected comparing patients aged below with those over 75, and the HR value was 0.72 (p<0.05). Not significant was the difference between groups with different schedules. Conclusions. This study confirmed the safety profile of metronomic vinorelbine and its applicability for patients unfit for standard chemotherapies and adds the possibility of considering this type of schedule not only for very elderly patients
A Study of the Antiferromagnetic Phase in the Hubbard Model by means of the Composite Operator Method
We have investigated the antiferromagnetic phase of the 2D, the 3D and the
extended Hubbard models on a bipartite cubic lattice by means of the Composite
Operator Method within a two-pole approximation. This approach yields a fully
self-consistent treatment of the antiferromagnetic state that respects the
symmetry properties of both the model and the algebra. The complete phase
diagram, as regards the antiferromagnetic and the paramagnetic phases, has been
drawn. We firstly reported, within a pole approximation, three kinds of
transitions at half-filling: Mott-Hubbard, Mott-Heisenberg and Heisenberg. We
have also found a metal-insulator transition, driven by doping, within the
antiferromagnetic phase. This latter is restricted to a very small region near
half filling and has, in contrast to what has been found by similar approaches,
a finite critical Coulomb interaction as lower bound at half filling. Finally,
it is worth noting that our antiferromagnetic gap has two independent
components: one due to the antiferromagnetic correlations and another coming
from the Mott-Hubbard mechanism.Comment: 20 pages, 37 figures, RevTeX, submitted to Phys. Rev.
Deformed versus undeformed cat states encoding qubit
We study the possibility of exploiting superpositions of coherent states to
encode qubit. A comparison between the use of deformed and undeformed bosonic
algebra is made in connection with the amplitude damping errors.Comment: 6 pages, 2 eps figures, to appear in J. Opt.
Underdoped cuprates phenomenology in the 2D Hubbard model within COM(SCBA)
The two-dimensional Hubbard model is studied within the Composite Operator
Method (COM) with the residual self-energy computed in the Self-Consistent Born
Approximation (SCBA). COM describes interacting electrons in terms of the new
elementary excitations appearing in the system owing to strong correlations;
residual interactions among these excitations are treated within the SCBA. The
anomalous features appearing in the spectral function A(k,\omega), the momentum
distribution function n(k) and the Fermi surface are analyzed for various
values of the filling (from overdoped to underdoped region) in the intermediate
coupling regime at low temperatures. For low doping, in contrast with the
ordinary Fermi-liquid behavior of a weakly-correlated metal found at high
doping, we report the opening of a pseudogap and some non-Fermi-liquid features
as measured for cuprates superconductors. In addition, we show the presence of
kinks in the calculated electronic dispersion in agreement with ARPES data.Comment: 5 pages, 5 figure
Decorated vertices with 3-edged cells in 2D foams: exact solutions and properties
The energy, area and excess energy of a decorated vertex in a 2D foam are
calculated. The general shape of the vertex and its decoration are described
analytically by a reference pattern mapped by a parametric Moebius
transformation. A single parameter of control allows to describe, in a common
framework, different types of decorations, by liquid triangles or 3-sided
bubbles, and other non-conventional cells. A solution is proposed to explain
the stability threshold in the flower problem.Comment: 13 pages, 17 figure
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