3 papers
cond-mat.str-el2001
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…
cond-mat.stat-mech2000
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…
cond-mat.stat-mech1998
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…