29 citations · 89 across the 8 of their papers we have counts for
8 papers
Fragmentation of SU(2)-invariant spin ladders
Giuseppe Albertini
A two-parameter family of quantum spin ladders with local bilinear and biquadratic interactions is shown to be solvable by a mapping onto fragments of integrable spin 1 chains. The…
Is the purely biquadratic spin 1 chain always massive?
Giuseppe Albertini
It is shown that the sl(2)q-invariant open antiferromagnetic XXZ spin chain with a boundary field has a gapless sector in the thermodynamic limit when its length is odd. Owing to a…
A novel exponent in the Equilibrium Shape of Crystals
S. R. Dahmen, B. Wehefritz, G. Albertini
A new exponent characterizing the rounding of crystal facets is found by mapping a crystal surface onto the asymmetric six-vertex model (i.e. with external fields h and v) and usin…
Direction dependent free energy singularity of the asymmetric six-vertex model
Giuseppe Albertini
The transition from the ordered commensurate phase to the incommensurate gaussian phase of the antiferroelectric asymmetric six-vertex model is investigated by keeping the temperat…
The free energy singularity of the asymmetric 6--vertex model and the excitations of the asymmetric XXZ chain
Giuseppe Albertini, Silvio Renato Dahmen, Birgit Wehefritz
We consider the asymmetric six--vertex model, {\it i.e.} the symmetric six--vertex model in an external field with both horizontal and vertical components, and the relevant asymmet…
Phase diagram of the non-hermitean asymmetric XXZ spin chain
Giuseppe Albertini, Silvio Renato Dahmen, Birgit Wehefritz
The low-lying excitations of the asymmetric spin chain are derived explicitly in the antiferromagnetic regime through the Bethe Ansatz. It is found that a massless and confor…