F
Friedrich Krien
Researcher at Jožef Stefan Institute
Publications - 23
Citations - 470
Friedrich Krien is an academic researcher from Jožef Stefan Institute. The author has contributed to research in topics: Hubbard model & Vertex (graph theory). The author has an hindex of 12, co-authored 19 publications receiving 321 citations. Previous affiliations of Friedrich Krien include Vienna University of Technology & International School for Advanced Studies.
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Ries crater and suevite revisited—Observations and modeling Part II: Modeling
Natalia Artemieva,Natalia Artemieva,Natalia Artemieva,Kai Wünnemann,Friedrich Krien,Wolf Uwe Reimold,Wolf Uwe Reimold,Dieter Stöffler +7 more
TL;DR: In this article, the authors present the results of numerical modeling of the formation of the Ries crater utilizing the two hydrocodes SOVA and iSALE, which allow them to reproduce crater shape, size, and morphology, and composition and extension of the continuous ejecta blanket.
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Effective Heisenberg Model and Exchange Interaction for Strongly Correlated Systems.
E. A. Stepanov,E. A. Stepanov,S. Brener,Friedrich Krien,Malte Harland,Alexander I. Lichtenstein,Alexander I. Lichtenstein,Mikhail I. Katsnelson,Mikhail I. Katsnelson +8 more
TL;DR: The extended Hubbard model is considered and a corresponding Heisenberg-like problem written in terms of spin operators is introduced, which reduces to a standard expression of the density functional theory that has been successfully used in practical calculations of magnetic properties of real materials.
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Single-boson exchange decomposition of the vertex function
TL;DR: In this article, a decomposition of the two-particle vertex function of the single-band Anderson impurity model is presented, which imparts a physical interpretation of the vertex in terms of the exchange of bosons of three flavors.
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Boson-exchange parquet solver for dual fermions
Friedrich Krien,Friedrich Krien,A. Valli,P. Chalupa,Massimo Capone,Alexander I. Lichtenstein,Alessandro Toschi +6 more
TL;DR: In this article, a parquet approximation within the dual-fermion formalism based on a partial bosonization of the dual vertex function is presented, which substantially reduces the computational cost of the calculation.
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Conservation in two-particle self-consistent extensions of dynamical mean-field theory
Friedrich Krien,Erik G. C. P. van Loon,Hartmut Hafermann,Junya Otsuki,Mikhail I. Katsnelson,Alexander I. Lichtenstein +5 more
TL;DR: In this article, the authors show that the mutual requirements of two-particle self-consistency and conservation lead to fundamental problems, and that no conserving approximation can exist.