Research on conducting and semiconducting solids has become one of the fashionable
subjects in the field of physics for the last four or five decades partly because of the …

We present an up-to-date survey of theoretical concepts and results in the field of one-
dimensional magnetism and of their relevance to experiments and real materials. Main …

In this paper we shall review the theoretical and experimental results obtained on simple
magnetic model systems. We shall consider the Heisenberg, XY and Ising type of interaction …

We demonstrate how quantum entanglement can be directly witnessed in the quasi-1D
Heisenberg antiferromagnet KCuF 3. We apply three entanglement witnesses—one tangle …

Spin-dynamical calculations on one-dimensional systems have relied heavily on classical
(s=∞) theories, despite abundant evidence that quantum effects can be extremely important …

The present status of theoretical and experimental investigations of solitary excitations in
one-dimensional magnetic systems is reviewed. A survey of exact solutions to the nonlinear …

The present situation in theoretical and experimental studies on one-dimensional magnetic
systems is fully discussed. Equal-time as well as the dynamic properties are included with …

A generalized Ginzburg-Landau theory is suggested to describe the phase transition of an
array of weakly coupled pseudo-one-dimensional chains. Using a mean-field …

In the past decade there has been considerable interest in the chemical and physical
properties of one-dimensional materials. Activity has recently increased due to the …

A «semi-polar» representation of the spin operators is introduced, which makes possible, in
the harmonic approximation, the definition of magnons for any wavelength at low …