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When constructing a Wilson chain to represent a quantum impurity model, theeffects of truncated bath modes are neglected. We show that their influence canbe kept track of systematically by constructing an "open Wilson chain" in whicheach site is coupled to a separate effective bath of its own. As a firstapplication, we use the method to cure the so-called mass-flow problem that canarise when using standard Wilson chains to treat impurity models withasymmetric bath spectral functions at finite temperature. We demonstrate thisfor the strongly sub-Ohmic spin-boson model at quantum criticality where wedirectly observe the flow towards a Gaussian critical fixed point.

Open Wilson chains for quantum impurity models: Keeping track of all bath modes