Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-02-20
Phys. Rev. B 62, 3259 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, including 7 figures
Scientific paper
10.1103/PhysRevB.62.3259
We study two Heisenberg spin-1/2 chains coupled by a frustrating ``zigzag'' interaction. We are particularly interested in the regime of weak interchain coupling, which is difficult to analyse by either numerical or analytical methods. Previous density matrix renormalisation group (DMRG) studies of the isotropic model with open boundary conditions and sizeable interchain coupling have established the presence of incommensurate correlations and of a spectral gap. By using twisted boundary conditions with arbitrary twist angle, we are able to determine the incommensurabilities both in the isotropic case and in the presence of an exchange anisotropy by means of exact diagonalisation of relatively short finite chains of up to 24 sites. Using twisted boundary conditions results in a very smooth dependence of the incommensurabilities on system size, which makes the extrapolation to infinite systems significantly easier than for open or periodic chains.
Aligia Armando A.
Batista Cristian D.
Essler Fabian H. L.
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