Fluctuation diagnostic of the nodal/antinodal dichotomy in the Hubbard model at weak coupling: a parquet dual fermion approach

Autor: G. Rohringer, Alexander I. Lichtenstein, Friedrich Krien

We apply the boson exchange parquet solver for dual fermions to the half-filled Hubbard model on a square lattice at small interaction. Our results establish that, in this regime, nonlocal vertex corrections play an important role in the formation of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::934d210b5cd09a81f869e13353a4c289
http://arxiv.org/abs/2010.05935

Robustness of the topological quantization of the Hall conductivity for correlated lattice electrons at finite temperatures

Autor: G. Rohringer, A. N. Rubtsov, Anton Markov

Publikováno v: Physical Review B. 100

Electrons on a two-dimensional lattice which is exposed to a strong uniform magnetic field show intriguing physical phenomena. The spectrum of such systems exhibits a complex (multi)band structure known as Hofstadter's butterfly. For fillings at whic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9d0955a32b0e073d27d641fb1b460f68
https://doi.org/10.1103/physrevb.100.115102

Analytical investigation of singularities in two-particle irreducible vertex functions of the Hubbard atom

Autor: Patrik Thunström, Sergio Ciuchi, Olle Gunnarsson, G. Rohringer

Publikováno v: Physical Review B 98 (2018). doi:10.1103/PhysRevB.98.235107
info:cnr-pdr/source/autori:Thunstroem, P.; Gunnarsson, O.; Ciuchi, Sergio; Rohringer, G./titolo:Analytical investigation of singularities in two-particle irreducible vertex functions of the Hubbard atom/doi:10.1103%2FPhysRevB.98.235107/rivista:Physical Review B/anno:2018/pagina_da:/pagina_a:/intervallo_pagine:/volume:98

Two-particle generalized susceptibilities and their irreducible vertex functions play a prominent role in the quantum many-body theory for correlated electron systems. They act as basic building blocks in the parquet formalism which provides a flexib

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::466851e92af1575d82d0e54479914c36
https://doi.org/10.1103/physrevb.98.235107

Complementary views on electron spectra: From fluctuation diagnostics to real-space correlations

Autor: Alessandro Toschi, Thomas Schäfer, Jaime Merino, Giorgio Sangiovanni, G. Rohringer, Olle Gunnarsson

Publikováno v: Physical Review B. 97

We study the relation between the microscopic properties of a many-body system and the electron spectra, experimentally accessible by photoemission. In a recent paper [Phys. Rev. Lett. 114, 236402 (2015)], we introduced the "fluctuation diagnostics"

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::27d728bc09061606d62c89010565c38b
https://doi.org/10.1103/physrevb.97.125134

Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory

Autor: A. A. Katanin, Alexander I. Lichtenstein, Karsten Held, Andrey E. Antipov, G. Rohringer, Alessandro Toschi, Hartmut Hafermann, Alexey N. Rubtsov, Mikhail I. Katsnelson

Publikováno v: Rev. Mod. Phys.
Reviews of Modern Physics
Reviews of Modern Physics, 90, 1-53
Reviews of Modern Physics, 90, 2, pp. 1-53

Strong electronic correlations pose one of the biggest challenges to solid state theory. We review recently developed methods that address this problem by starting with the local, eminently important correlations of dynamical mean field theory (DMFT)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8bcc8f7b7e45448beef4355558eba5bd
http://arxiv.org/abs/1705.00024