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Efficient mapping for Anderson impurity problems with matrix product states

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arxiv 2012.01424 v1 pith:IY6HJVXO submitted 2020-12-02 cond-mat.str-el quant-ph

classification cond-mat.str-el quant-ph
keywords andersonefficientimpuritymappingmatrixproblemsproductstates
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We propose an efficient algorithm to numerically solve Anderson impurity problems using matrix product states. By introducing a modified chain mapping we obtain significantly lower entanglement, as compared to all previous attempts, while keeping the short-range nature of the couplings. Our approach naturally extends to finite temperatures, with applications to dynamical mean field theory, non-equilibrium dynamics and quantum transport.

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