In quantum theory Hamilton operators with spininteractions have a long history [1 – 5]. Triple spin interaction have been studied by several authors [6 – 19]. Iglói [6] investigated an Ising model with three-spin interaction by finite-size scaling and applying free boundary conditions. Vanderzande and Iglói [7] studied the critical behaviour and logarithmic corrections of a quantum model with t...

We study the strongly coupled 2-flavor lattice Schwinger model and the SU(2)-color QCD2. The strong coupling limit, even with its inherent nonuniversality, makes accurate predictions of the spectrum of the continuum models and provides an intuitive picture of the gauge theory vacuum. The massive excitations of the gauge model are computable in terms of spin-spin correlators of the quantum Heise...

We report here specialized functions incorporated recently in the rigid-body docking software toolkit TagDock to utilize electron paramagnetic resonance derived (EPR-derived) interresidue distance measurements and spin-label accessibility data. The TagDock package extensions include a custom methanethiosulfonate spin label rotamer library to enable explicit, all-atom spin-label side-chain model...

A new scheme to study the XXZ spin chain in massive regime is introduced by Davies et al in [1]. In this scheme, which is called “quantum symmetry approach”, the space of states is identified with some Uq(A (1) 1 )-module. Under this identification, the XXZ Hamiltonian can be constructed on this module as an operator which commutes with the action of Uq(A (1) 1 ). Furthermore, the row transfer ...

The free energy and correlation lengths of the spin-1/2 XY Z chain are studied at finite temperature. We use the quantum transfer matrix approach and derive non-linear integral equations for all eigenvalues. Analytic results are presented for the low-temperature asymptotics, in particular for the critical XXZ chain in an external magnetic field. These results are compared to predictions by conf...

The model of Kondo chain with M-fold degenerate band of conduction electrons of spin 1/2 at half filling interacting with localized spins S is studied. It is shown that due to the instanton effects the spin sector reveals itself in optical conductivity. Namely, the density of the charge current at large wave vector k ≈ π is proportional to the density of topological charge of the staggered magn...

We first analyze the spinning string in the magnetic field deformed AdS5×S spacetime which was constructed in our previous paper. It is seen that the associated effective Lagrangian of string sigma model describes the spin chain model with magnetic field, in which the corresponding spin vector has been properly deformed and is living on the deformed S. The mechanism of spin deformation is descr...

The complete one-loop, planar dilatation operator of the N = 4 superconformal gauge theory was recently derived and shown to be integrable. Here, we present further compelling evidence for a generalisation of this integrable structure to higher orders of the coupling constant. For that we consider the su(2|3) subsector and investigate the restrictions imposed on the spin chain Hamiltonian by th...

[1] Dekker and Rietkerk [2005] (hereinafter referred to as DR) raise some valid points regarding our paper ‘‘Multiple equilibrium states and the abrupt transitions in a dynamical system of soil water interacting with vegetation’’ [Zeng et al., 2004] (hereinafter referred to as XZ). We appreciate the opportunity to clarify these issues here and hope this dialogue (between scientists working on h...