Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Fabian B. Kugler"'
Autor:
Patrick Chalupa-Gantner, Fabian B. Kugler, Cornelia Hille, Jan von Delft, Sabine Andergassen, Alessandro Toschi
Publikováno v:
Physical Review Research, Vol 4, Iss 2, p 023050 (2022)
We investigate several fundamental characteristics of the multiloop functional renormalization group (mfRG) flow by hands of its application to a prototypical many-electron system: the Anderson impurity model (AIM). We first analyze the convergence o
Externí odkaz:
https://doaj.org/article/c9f88fa850ed49b4bf97d6d86a608a88
Publikováno v:
Physical Review X, Vol 11, Iss 4, p 041007 (2021)
Local three- and four-point correlators yield important insight into strongly correlated systems and have many applications. However, the nonperturbative, accurate computation of multipoint correlators is challenging, particularly in the real-frequen
Externí odkaz:
https://doaj.org/article/a064bec4c6de444f97a25d3ae75fd07e
Publikováno v:
Physical Review X, Vol 11, Iss 4, p 041006 (2021)
The many-body problem is usually approached from one of two perspectives: the first originates from an action and is based on Feynman diagrams, the second is centered around a Hamiltonian and deals with quantum states and operators. The connection be
Externí odkaz:
https://doaj.org/article/75b9162a87a5449894f4bc6b9387aadc
Autor:
Cornelia Hille, Fabian B. Kugler, Christian J. Eckhardt, Yuan-Yao He, Anna Kauch, Carsten Honerkamp, Alessandro Toschi, Sabine Andergassen
Publikováno v:
Physical Review Research, Vol 2, Iss 3, p 033372 (2020)
Using a leading algorithmic implementation of the functional renormalization group (fRG) for interacting fermions on two-dimensional lattices, we provide a detailed analysis of its quantitative reliability for the Hubbard model. In particular, we sho
Externí odkaz:
https://doaj.org/article/2caa800542fd40d19d26b6036728daab
Publikováno v:
European Physical Journal B
The recently introduced single-boson exchange (SBE) decomposition of the four-point vertex of interacting fermionic many-body systems is a conceptually and computationally appealing parametrization of the vertex. It relies on the notion of reducibili
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::79160e257e9a9bd0a595ace559dafd65
https://hdl.handle.net/21.11116/0000-000A-A2ED-421.11116/0000-000A-A2EF-221.11116/0000-000A-C64C-2
https://hdl.handle.net/21.11116/0000-000A-A2ED-421.11116/0000-000A-A2EF-221.11116/0000-000A-C64C-2
Autor:
Marc K. Ritter, Dominik Kiese, Tobias Müller, Fabian B. Kugler, Ronny Thomale, Simon Trebst, Jan von Delft
Publikováno v:
The European Physical Journal B. 95
The pseudofermion functional renormalization group (pffRG) is a computational method for determining zero-temperature phase diagrams of frustrated quantum magnets. In a recent methodological advance, the commonly employed Katanin truncation of the fl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68bea157a031ee88caaf873e3ee71afa
https://doi.org/10.1140/epjb/s10051-022-00349-2
https://doi.org/10.1140/epjb/s10051-022-00349-2
Publikováno v:
SciPost Physics, Vol 6, Iss 1, p 009 (2019)
We present a functional renormalization group (fRG) study of the two dimensional Hubbard model, performed with an algorithmic implementation which lifts some of the common approximations made in fRG calculations. In particular, in our fRG flow; (i
Externí odkaz:
https://doaj.org/article/d30dedd8e9b843bdbf4a1641b7758c66
Autor:
Fabian B. Kugler, Gabriel Kotliar
Publikováno v:
Physical review letters. 129(9)
The localization-delocalization transition is at the heart of strong correlation physics. Recently, there is great interest in multiorbital systems where this transition can be restricted to certain orbitals, leading to an orbital-selective Mott phas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4afc1c2d931aba026bbc45e8753659f
https://pubmed.ncbi.nlm.nih.gov/36083681
https://pubmed.ncbi.nlm.nih.gov/36083681
Publikováno v:
Physical Review X, Vol 11, Iss 4, p 041006 (2021)
The many-body problem is usually approached from one of two perspectives: the first originates from an action and is based on Feynman diagrams, the second is centered around a Hamiltonian and deals with quantum states and operators. The connection be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bed896dc25117578d5c931982b743c0e
https://doi.org/10.1103/physrevx.11.041006
https://doi.org/10.1103/physrevx.11.041006
Publikováno v:
Physical Review X, Vol 11, Iss 4, p 041007 (2021)
Local three- and four-point correlators yield important insight into strongly correlated systems and have many applications. However, the nonperturbative, accurate computation of multipoint correlators is challenging, particularly in the real-frequen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e1aca541decd0df378b5421f8272b837