Partial bosonization for the two-dimensional Hubbard model

• Verfasst von: Denz, Tobias [VerfasserIn]
• Verfasst von: Mitter, Mario [VerfasserIn]
• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Verfasst von: Wetterich, Christof [VerfasserIn]
• Verfasst von: Yamada, Masatoshi [VerfasserIn]
• Titel: Partial bosonization for the two-dimensional Hubbard model
• Verf.angabe: Tobias Denz, Mario Mitter, Jan M. Pawlowski, Christof Wetterich, Masatoshi Yamada
• E-Jahr: 2020
• Jahr: 14 April 2020
• Fussnoten: Gesehen am 03.12.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2020
• Band/Heft Quelle: 101(2020,15) Artikel-Nummer 155115, 16 Seiten
• ISSN Quelle: 2469-9969
• DOI: doi:10.1103/PhysRevB.101.155115
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1741921988

Abstract

Partial bosonization of the two-dimensional Hubbard model focuses the functional renormalization flow on channels in which interactions become strong and local order sets in. We compare the momentum structure of the four-fermion vertex, obtained on the basis of a patching approximation, to an effective bosonic description. For parameters in the antiferromagnetic phase near the onset of local antiferromagnetic order, the interaction of the electrons is indeed well described by the exchange of collective bosonic degrees of freedom. The residual four-fermion vertex after the subtraction of the bosonic-exchange contribution is small. We propose that similar partial bosonization techniques can improve the accuracy of renormalization flow studies also for the case of competing order.