An overview of one-and two-dimensional quantum spin systems based on transition-metal
oxides and halides of current interest is given, such as spin-Peierls, spin-dimer …

The magnetic susceptibility χ*(t) and specific heat C (t) versus temperature t of the spin S=
1/2 antiferromagnetic (AF) alternating-exchange (J 1 and J 2) Heisenberg chain are studied …

We review exact numerical results for one-dimensional quantum systems with half-filled
bands. The topics covered include Peierls transitions in Holstein, Fröhlich, Su-Schrieffer …

We study the one-dimensional Holstein model with spin-1 2 electrons at half filling. Ground-
state properties are calculated for long chains with great accuracy using the density-matrix …

Using a new version of the density-matrix renormalization group we determine the phase
diagram of a model of an antiferromagnetic Heisenberg spin chain where the spins interact …

We study one-dimensional Su-Schrieffer-Heeger (SSH) models with quantum phonons
using a continuous-time quantum Monte Carlo method. Within statistical errors, we obtain …

The exchange interactions in polycrystalline samples of Ca 1− x La x MnO 3 (0.00≤ x≤
0.05) are studied by means of Raman scattering and electron paramagnetic resonance …

We study the effect of bond dissipation on the one-dimensional antiferromagnetic spin-$1/2$
Heisenberg model. In analogy to the spin-Peierls problem, the dissipative bath is described …

Abstract We report quantum Monte Carlo (stochastic series expansion) results for the
transition from a Mott insulator to a dimerized Peierls insulating state in a half-filled, one …

Using random-phase approximation results, mean-field theory, and refined data for the
polarization vectors we determine the coupling constants of the four Peierls-active phonon …