Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Other Theoretical Topics

TT 71.2: Vortrag

Freitag, 20. März 2020, 09:45–10:00, HSZ 304

Constrained Random Phase Approximation: Why and When it Works — •Erik van Loon1, Malte Rösner2, Mikhail Katsnelson2, and Tim Wehling11Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen, Germany — 2Radboud University, Nijmegen, the Netherlands

The constrained Random Phase Approximation (cRPA) is an important part of the modern theory of correlated electron materials. In the downfolding from the full band structure to an effective low-energy (Hubbard) model, the cRPA provides a way to calculate the Hubbard parameter U for the low-energy model, taking into account screening by the other electronic states. Although it is a popular tool, a formal justification for the cRPA has been lacking. Here, we show when the cRPA is a good approximation.

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