G. B. Martins

Superconductivity in the two-dimensional t-J model

Using computational techniques, it is shown that pairing is a robust property of hole-doped antiferromagnetic insulators. In one dimension and for two-leg ladder systems, a BCS-like variational wave function with long-bond spin singlets and a Jastrow factor provides an accurate representation of the ground state of the t-J model, even though strong quantum fluctuations destroy the off-diagonal superconducting long-range order in this case. However, in two dimensions it is argued-and numerically confirmed using several techniques, especially quantum Monte Carlo-that quantum fluctuations are not strong enough to suppress superconductivity.

Magnetic properties of the frustrated antiferromagnetic spinel ZnCr_ {2} O_ {4} and the spin-glass Zn_ {1-x} Cd_ {x} Cr_ {2} O_ {4}(x= 0.05‚ 0.10)

The

Transport properties and Kondo correlations in nanostructures: Time-dependent DMRG method applied to quantum dots coupled to Wilson chains

T

LOCAL ENHANCEMENT OF ANTIFERROMAGNETIC CORRELATIONS BY NONMAGNETIC IMPURITIES

-dependence (2- 400 K) of the electron paramagnetic resonance (EPR), magnetic susceptibility,

ENHANCEMENT OF ANTIFERROMAGNETIC CORRELATIONS INDUCED BY NONMAGNETIC IMPURITIES : ORIGIN AND PREDICTIONS FOR NMR EXPERIMENTS

\chi (T)

Neutron and ARPES constraints on the couplings of the multiorbital Hubbard model for the iron pnictides

, and specific heat,

Numerical results indicate a half-filling SU(4) Kondo state in carbon nanotubes

C_{v}(T)

Method to study highly correlated nanostructures: The logarithmic-discretization embedded-cluster approximation

, of the

Interference effects in the conductance of multilevel quantum dots

normal

Electron transport through a molecular conductor with center-of-mass motion.

antiferromagnetic (AFM) spinel ZnCr