We study the finite-temperature behavior of two-dimensional S= 1/2 Heisenberg
antiferromagnets with very weak easy-axis and easy-plane exchange anisotropies. By means of …

The capability of faithfully transmit quantum states and entanglement through quantum
channels is one of the key requirements for the development of quantum devices. Different …

High-quality quantum-state and entanglement transfer can be achieved in an unmodulated
spin bus operating in the ballistic regime, which occurs when the endpoint qubits A and B are …

Results of Monte Carlo simulations of the ferromagnetic classical XXZ model on a square
lattice are reported for interactions of the out of plane spin components λ varying between 0 …

An overview on the theoretic formalism and up to date applications in quantum condensed
matter physics of the effective potential and effective Hamiltonian methods is given. The main …

We consider the Heisenberg antiferromagnet on the square lattice with S= 1/2 and very weak
easy-plane exchange anisotropy; by means of the quantum Monte Carlo method, based on …

Making use of the quantum Monte Carlo method based on the worm algorithm, we study the
thermodynamic behavior of the S= 1 2 isotropic Heisenberg antiferromagnet on the square …

The antiferromagnetic classical XXZ model with easy-plane exchange anisotropy on the
triangular lattice, which causes frustration of the spin alignment, is studied by means of Monte …

One-dimensional arrays with nearest-neighbor interactions occur in several physical contexts:
magnetic chains, Josephson-junction and quantum-dot arrays, 1D boson and fermion …

The standard system-plus-reservoir approach used in the study of dissipative systems can be
meaningfully generalized to a dissipative coupling involving the momentum, instead of the …