Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Evgeny Kozik"'
Autor:
Evgeny Kozik
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-8 (2024)
Abstract Feynman’s diagrammatic series is a common language for a formally exact theoretical description of systems of infinitely-many interacting quantum particles, as well as a foundation for precision computational techniques. Here we introduce
Externí odkaz:
https://doaj.org/article/9e113a2bf8074ed3b867c4c39542975b
Publikováno v:
SciPost Physics, Vol 16, Iss 5, p 133 (2024)
In the standard framework of self-consistent many-body perturbation theory, the skeleton series for the self-energy is truncated at a finite order N and plugged into the Dyson equation, which is then solved for the propagator $G_N$. We consider two e
Externí odkaz:
https://doaj.org/article/a0afc0ef4e8b4d2a903ef1980bd871c4
Autor:
Thomas Schäfer, Nils Wentzell, Fedor Šimkovic, IV, Yuan-Yao He, Cornelia Hille, Marcel Klett, Christian J. Eckhardt, Behnam Arzhang, Viktor Harkov, François-Marie Le Régent, Alfred Kirsch, Yan Wang, Aaram J. Kim, Evgeny Kozik, Evgeny A. Stepanov, Anna Kauch, Sabine Andergassen, Philipp Hansmann, Daniel Rohe, Yuri M. Vilk, James P. F. LeBlanc, Shiwei Zhang, A.-M. S. Tremblay, Michel Ferrero, Olivier Parcollet, Antoine Georges
Publikováno v:
Physical Review X, Vol 11, Iss 1, p 011058 (2021)
The Hubbard model represents the fundamental model for interacting quantum systems and electronic correlations. Using the two-dimensional half-filled Hubbard model at weak coupling as a testing ground, we perform a comparative study of a comprehensiv
Externí odkaz:
https://doaj.org/article/203133f3a68c4847877129268659a912
Autor:
Evgeny Kozik
Publikováno v:
Nature Physics. 18:1276-1277
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f316021d3c3247813a612017d6cc5fe4
https://doi.org/10.1038/s41567-022-01733-6
https://doi.org/10.1038/s41567-022-01733-6
We implement the GW space-Time method at finite temperatures, in which the Green's function G and the screened Coulomb interaction W are represented in the real space on a suitable mesh and in imaginary time in terms of Chebyshev polynomials, paying
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a14d5cf0f8552eb926743408038a2b81
http://wrap.warwick.ac.uk/165734/1/WRAP-GW-space-time-method-energy-band-gap-of-solid-hydrogen-Davydov-2022.pdf
http://wrap.warwick.ac.uk/165734/1/WRAP-GW-space-time-method-energy-band-gap-of-solid-hydrogen-Davydov-2022.pdf
Publikováno v:
Physical review letters. 129(10)
Diagrammatic Monte Carlo -- the technique for numerically exact summation of all Feynman diagrams to high orders -- offers a unique unbiased probe of continuous phase transitions. Being formulated directly in the thermodynamic limit, the diagrammatic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d654daf41a88e03e5920b87a62052bd9
https://pubmed.ncbi.nlm.nih.gov/36112452
https://pubmed.ncbi.nlm.nih.gov/36112452
Publikováno v:
Physical Review B. 104
In nonperturbative regimes, the superfluid instability in the two-dimensional Hubbard model can be described by an emergent BCS theory with small effective pairing constants. We compute the effective couplings using a controlled bold-line diagrammati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ffaf1857e925342b47d412d0c0a9bb43
https://doi.org/10.1103/physrevb.104.l020507
https://doi.org/10.1103/physrevb.104.l020507
Publikováno v:
Physical Review Letters. 126
The major obstacle preventing Feynman diagrammatic expansions from accurately solving many-fermion systems in strongly correlated regimes is the series slow convergence or divergence problem. Several techniques have been proposed to address this issu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::22f387dfb6ef5cb69e238cc1541c0a43
https://doi.org/10.1103/physrevlett.126.257001
https://doi.org/10.1103/physrevlett.126.257001
Autor:
M. Vandelli, Evgeny Kozik, Jan Gukelberger, Viktor Harkov, E. A. Stepanov, Alexander I. Lichtenstein, Angel Rubio
Publikováno v:
Physical Review B
Digital.CSIC. Repositorio Institucional del CSIC
instname
Digital.CSIC. Repositorio Institucional del CSIC
instname
In this work we introduce the dual boson diagrammatic Monte Carlo technique for strongly interacting electronic systems. This method combines the strength of dynamical mean-filed theory for nonperturbative description of local correlations with the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d6c61f15889bd1bf1f93269facd7e99
http://arxiv.org/abs/2007.04669
http://arxiv.org/abs/2007.04669
Publikováno v:
Physical Review Letters. 124
The $2d$ Hubbard model with nearest-neighbour hopping on the square lattice and an average of one electron per site is known to undergo an extended crossover from metallic to insulating behavior driven by proliferating antiferromagnetic correlations.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::97570a6c032e7afe3574cfa51e9558da
https://doi.org/10.1103/physrevlett.124.117602
https://doi.org/10.1103/physrevlett.124.117602