Abstract
We discuss in detail a modified variational matrix product state algorithm for periodicboundary conditions, based on a recent work by Pippan et al (2010 Phys. Rev. B 81081103(R)), which enables one to study large systems on a ring (composed ofN ∼ 102 sites). In particular, we introduce a couple of improvements allowing us to enhancethe algorithm in terms of stability and reliability. We employ such a methodto compute the stiffness of one-dimensional strongly correlated quantum latticesystems. The accuracy of our calculations is tested in the exactly solvable spin-1/2 Heisenberg chain.
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