Numerical Contraction of the Tensor Network generated by the Algebraic Bethe Ansatz

Details Numerical Contraction of the Tensor Network generated by the Algebraic Bethe Ansatz Numerical Contraction of the Tensor Network generated by the Algebraic Bethe Ansatz

2012-01-26

arxiv.org/abs/1201.5636v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

The algebraic Bethe Ansatz is a prosperous and well-established method for solving one-dimensional quantum models exactly. The solution of the complex eigenvalue problem is thereby reduced to the solution of a set of algebraic equations. Whereas the spectrum is usually obtained directly, the eigenstates are available only in terms of complex mathematical expressions. This makes it very hard in general to extract properties from the states, like, for example, correlation functions. In our work, we apply the tools of Tensor Network States to describe the eigenstates approximately as Matrix Product States. From the Matrix Product State expression, we then obtain observables like correlation functions directly.

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