78 citations · 292 across the 17 of their papers we have counts for
17 papers
Theory of defect-mediated ionic transport in Li, Na and K beta and beta prime prime aluminas
Suchit Negi, Alexandra Carvalho, A. H. Castro Neto
Alkali metal / aluminas are among the fastest ionic conductors, yet little is understood about the role of defects in the ion transport mechanism. Here, we use…
Chiral filtering in graphene with coupled valleys
Pedro L. S. Lopes, A. H. Castro Neto, A. O. Caldeira
We analyze the problem of electronic transmission through different regions of a graphene sheet that are characterized by different types of connections between the Dirac points. T…
Hybridization driven quantum critical behavior in weakly-itinerant ferromagnets
M. B. Silva Neto, A. H. Castro Neto, J. S. Kim +1
We investigate the unusual magnetic properties of nearly-critical, weakly-itinerant ferromagnets with general formula UTX, where T=Rh,Co and X=Ge,Si. As a unique feature about thes…
Effect of impurities on quasi-2D quantum antiferromagnet
A. L. Chernyshev, Y. C. Chen, A. H. Castro Neto
We have studied the static and dynamic properties of quasi-two-dimensional quantum antiferromagnets (AF) diluted with spinless impurities using spin-wave theory and -matrix appr…
Effect of planar impurities on the superfluid density of striped cuprates
A. H. Castro Neto, A. V. Balatsky
We propose a mechanism for superconductivity suppression in stripe-correlated cuprates based on the pinning of the stripes by impurities, such as Zn. The suppression of superfluid…
Theory of Spin Fluctuations in Striped Phases of Doped Antiferromagnetic Cuprates
Daniel Hone, A. H. Castro Neto
We study the properties of generalized striped phases of doped cuprate planar quantum antiferromagnets. We invoke an effective, spatially anisotropic, non-linear sigma model in two…
Luttinger Stripes in Antiferromagnets
A. H. Castro Neto
We propose a model for the physics of stripes in antiferromagnets in which the stripes are described by Luttinger liquids hybridized with antiferromagnetic domains. Using bosonizat…
Magnetic-field and chemical-potential effects on the low-energy separation
J. M. P. Carmelo, A. H. Castro Neto
We show that in the presence of a magnetic field the usual low-energy separation of the Hubbard chain is replaced by a ``'' and ``'' separation. Here and refer to sma…
Electrons, pseudoparticles, and quasiparticles in the one-dimensional many-electron problem
J. M. P. Carmelo, A. H. Castro Neto
We generalize the concept of quasiparticle for one-dimensional (1D) interacting electronic systems. The and quasiparticles recombine the pseudoparticle co…
Motion of heavy particles coupled to fermionic and bosonic environments in one dimension
A. O. Caldeira, A. H. Castro Neto
Making use of a simple unitary transformation we change the hamiltonian of a particle coupled to an one dimensional gas of bosons or fermions to a new form from which the many body…
Pseudoparticle-operator description of an interacting Bose gas
A. H. Castro Neto, H. Q. Lin, H. -Y Chen +1
We write the Hamiltonian of the Bose gas with two-body repulsive -function potential in a pseudoparticle operator basis which diagonalizes the problem via the Bethe ansatz. In t…
Conservation laws and bosonization in integrable Luttinger liquids
J. M. P. Carmelo, A. H. Castro Neto, D. K. Campbell
We examine and explain the Luttinger-liquid character of models solvable by the Bethe ansatz by introducing a suitable bosonic operator algebra. In the case of the Hubbard chain, t…
New perturbation theory of low-dimensional quantum liquids II: operator description of Virasoro algebras in integrable systems
J. M. P. Carmelo, A. H. Castro Neto, D. K. Campbell
We show that the recently developed {\it pseudoparticle operator algebra} which generates the low-energy Hamiltonian eigenstates of multicomponent integrable systems also provides…
Dissipative quantum systems modeled by a two level reservoir coupling
A. O. Caldeira, A. H. Castro Neto, T. Oliveira de Carvalho
The coupling between a quantum dynamical system and a two-level system reservoir is analysed within the framework of the Feynman-Vernon theory. We stress the differences between th…
On Quantum Scattering of a System with Internal Degrees of Freedom
A. H. Castro Neto, A. O. Caldeira
We study the quantum tunnelling of a very complex object of which only part is coupled to an external potential ( the potential barrier ). We treat this problem as the tunnelling o…
Dynamical decoupling and Kac-Moody current representation in multicomponent integrable systems
J. M. P. Carmelo, A. H. Castro Neto
The conformal invariant character of -multicomponent integrable systems (with branches of gapless excitations) is described from the point of view of the response to curvatu…
An alternative approach for the dynamics of polarons in one dimension
A. H. Castro Neto, A. O. Caldeira
We developed a new method based on functional integration to treat the dynamics of polarons in one-dimensional systems. We treat the acoustical and the optical case in an unified m…