36 citations · 139 across the 8 of their papers we have counts for
8 papers
The XX--model with boundaries. Part I: Diagonalization of the finite chain
Ulrich Bilstein, Birgit Wehefritz
This is the first of three papers dealing with the XX finite quantum chain with arbitrary, not necessarily hermitian, boundary terms. This extends previous work where the periodic…
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…
Spectra of non-hermitian quantum spin chains describing boundary induced phase transitions
Ulrich Bilstein, Birgit Wehefritz
The spectrum of the non-hermitian asymmetric XXZ-chain with additional non-diagonal boundary terms is studied. The lowest lying eigenvalues are determined numerically. For the ferr…
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…
Finite-Size Scaling Studies of Reaction-Diffusion Systems, Part I: Periodic Boundary Conditions
Klaus Krebs, Markus Pfannmueller, Birgit Wehefritz
The finite-size scaling function and the leading corrections for the single species 1D coagulation model and the annihilation model $(A + A \rightarrow \emp…