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Efficient mapping for Anderson impurity problems with matrix product states
Lucas Kohn, G. Santoro·December 2, 2020·DOI: 10.1103/PhysRevB.104.014303
Physics
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Abstract
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.