36 citations · 66 across the 4 of their papers we have counts for
5 papers
The XX-model with boundaries. Part III:Magnetization profiles and boundary bound states
Ulrich Bilstein
We calculate the magnetization profiles of the and operators for the XX-model with hermitian boundary terms. We study the profiles on the finite chain and in the co…
The "topological" charge for the finite XX quantum chain
Ulrich Bilstein, Vladimir Rittenberg
It is shown that an operator (in general non-local) commutes with the Hamiltonian describing the finite XX quantum chain with certain non-diagonal boundary terms. In the infinite v…
The XX-model with boundaries. Part II: Finite size scaling and partition functions
Ulrich Bilstein
We compute the continuum limit of the spectra for the XX-model with arbitrary complex boundary fields. In the case of hermitian boundary terms one obtains the partition functions o…
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…
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…