666 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade Federal do Rio de JaneiroBR289 papers
- Universidade de São PauloBR215 papers
- Centro Brasileiro de Pesquisas FísicasBR188 papers
- Centre National de la Recherche ScientifiqueFR165 papers
- Universidade Estadual de Campinas (UNICAMP)BR156 papers
- Universidade Federal do ABCBR123 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di NapoliIT103 papers
- Radboud University NijmegenNL103 papers
- Universidad Nacional Autónoma de MéxicoMX101 papers
- Universidade do Estado do Rio de JaneiroBR98 papers
- Consejo Nacional de Investigaciones Científicas y TécnicasAR94 papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR94 papers
41 papers · 1 filter
Muon excess at sea level from solar flares in association with the Fermi GBM spacecraft detector
C. R. A. Augusto, C. E. Navia, K. H. Tsui +2
This paper presents results of an ongoing survey on the associations between muon excesses at ground level registered by the Tupi telescopes and transient solar events, two solar f…
Long-range quantum discord in critical spin systems
J. Maziero, L. C. Céleri, R. M. Serra +1
We show that quantum correlations as quantified by quantum discord can characterize quantum phase transitions by exhibiting nontrivial long-range decay as a function of distance in…
Vortex and gap generation in gauge models of graphene
O. Oliveira, C. E. Cordeiro, A. Delfino +2
Effective quantum field theoretical continuum models for graphene are investigated. The models include a complex scalar field and a vector gauge field. Different gauge theories are…
Dynamical gap generation in graphene nanoribbons: An effective relativistic field theoretical model
A. J. Chaves, G. D. Lima, W. de Paula +4
We show that the assumption of a nontrivial zero band gap for a graphene sheet within an effective relativistic field theoretical model description of interacting Dirac electrons o…
Bethe lattice solution of a model of SAW's with up to 3 monomers per site and no restriction
T. J. Oliveira, J. F. Stilck
In the multiple monomers per site (MMS) model, polymeric chains are represented by walks on a lattice which may visit each site up to K times. We have solved the unrestricted versi…
Static magnetic order of SrAOFeAs (A = Sc and V) revealed by local probes
J. Munevar, D. R. Sanchez, M. Alzamora +10
Static magnetic order of quasi two-dimensional FeAs compounds Sr4A2O6-xFe2As2, with A = Sc and V, has been detected by 57Fe Moessbauer and muon spin relaxation (μSR) spectroscopies…
Matter-wave 2D solitons in crossed linear and nonlinear optical lattices
H. L. F. da Luz, F. Kh. Abdullaev, A. Gammal +2
It is demonstrated the existence of multidimensional matter-wave solitons in a crossed optical lattice (OL) with linear OL in the direction and nonlinear OL (NOL) in the di…
Blow-up phenomena for scalar-flat metrics on manifolds with boundary
Sergio Almaraz
Let (M,g) be a compact n-dimensional Riemannian manifold with boundary. This article is concerned with the set of scalar-flat metrics on M which are in the conformal class of g and…
Fractional topological phase for entangled qudits
L. E. Oxman, A. Z. Khoury
We investigate the topological structure of entangled qudits under unitary local operations. Different sectors are identified in the evolution, and their geometrical and topologica…
Affine gauge theory of gravity and its reduction to the Riemann-Cartan geometry
R. F. Sobreiro, V. J. Vasquez Otoya
We discuss a possible framework for the construction of a quantum gravity theory where the principles of QFT and general relativity can coexist harmonically. Moreover, in order to…
Fluctuations in a superconducting quantum critical point of multi-band metals
Aline Ramires, Mucio A. Continentino
In multi-band metals quasi-particles arising from different atomic orbitals coexist at a common Fermi surface. Superconductivity in these materials may appear due to interactions w…
Enhancement of sub-barrier fusion of two-neutron halo nuclei
P. R. S. Gomes, L. F. Canto, J. Lubian +1
The tunneling of composite systems, where breakup may occur during the barrier penetration process is considered in connection with the fusion of halo-like radioactive, neutron- an…
Graphene as a non-magnetic spin-current lens
F. S. M. Guimarães, A. T. Costa, R. B. Muniz +1
In spintronics, the ability to transport magnetic information often depends on the existence of a spin current traveling between two different magnetic objects acting as source and…
The high-temperature expansion of the classical Ising model with S_z^2 term
M. T. Thomaz, O. Rojas
We derive the high-temperature expansion of the Helmholtz free energy up to the order β^{17} of the one-dimensional spin-S Ising model, with single-ion anisotropy term, in the pres…
Love kills: Simulations in Penna Ageing Model
D. Stauffer, S. Cebrat, T. J. P. Penna +1
The standard Penna ageing model with sexual reproduction is enlarged by adding additional bit-strings for love: Marriage happens only if the male love strings are sufficiently diff…
Fermionic van Hemmen Spin Glass Model with a Transverse Field
S. G. Magalhaes, F. M. Zimmer, C. V. Morais
In the present work it is studied the fermionic van Hemmen model for the spin glass (SG) with a transverse magnetic field . In this model, the spin operators are written as a bi…
Consequence of reputation in the Sznajd consensus model
Nuno Crokidakis, Fabricio L. Forgerini
In this work we study a modified version of the Sznajd sociophysics model. In particular we introduce reputation, a mechanism that limits the capacity of persuasion of the agents.…
Spin waves in zigzag graphene nanoribbons and the stability of edge ferromagnetism
F. Culchac, A. Latge, A. T. Costa
We study the low energy spin excitations of zigzag graphene nanoribbons of varying width. We find their energy dispersion at small wave vector to be dominated by antiferromagnetic…
Diagonal deformations of thin center vortices and their stability in Yang-Mills theories
L. E. Oxman
The importance of center vortices for the understanding of the confining properties of SU(N) Yang-Mills theories is well established in the lattice. However, in the continuum, ther…
Disorder and Electronic Transport in Graphene
Eduardo R. Mucciolo, Caio H. Lewenkopf
In this review, we provide an account of the recent progress in understanding electronic transport in disordered graphene systems. Starting from a theoretical description that emph…
Comment on the paper "Random Quantum Circuits are Approximate 2-designs"
Igor Tuche Diniz, Daniel Jonathan
In [A.W. Harrow and R.A. Low, Commun. Math. Phys. 291, 257-302 (2009)], it was shown that a quantum circuit composed of random 2-qubit gates converges to an approximate quantum 2-d…
Search for fingerprints of disoriented chiral condensates in cosmic ray showers
R. M. de Almeida, J. R. T. de Mello Neto, E. S. Fraga +1
Although the generation of disoriented chiral condensates (DCCs), where the order parameter for chiral symmetry breaking is misaligned with respect to the vacuum direction in isosp…
Nucleon-nucleon scattering within a multiple subtractive renormalization approach
V. S. Timoteo, T. Frederico, A. Delfino +1
A methodology to renormalize the nucleon-nucleon interaction, using a recursive multiple subtraction approach to construct the kernel of the scattering equation, is presented. We s…
Dynamical magnetic excitations of nanostructures from first-principles
S. Lounis, A. T. Costa, R. B. Muniz +1
Within time-dependent density functional theory, combined with the Korringa-Kohn-Rostoker Green functions, we devise a real space method to investigate spin dynamics. Our scheme en…