The electron–electron and electron–phonon interactions play an important role in correlated materials, being key features for spin, charge and pair correlations. Thus, here we investigate their effects in strongly correlated systems by performing unbiased quantum Monte Carlo simulations in the square lattice Hubbard-Holstein model at half-filling. We study the competition and interplay between antiferromagnetism (AFM) and charge-density wave (CDW), establishing its very rich phase diagram. In the region between AFM and CDW phases, we have found an enhancement of superconducting pairing correlations, favouring (nonlocal) s-wave pairs. Our study sheds light over past inconsistencies in the literature, in particular the emergence of CDW in the pure Holstein model case.
Phase diagram of the two-dimensional Hubbard-Holstein model / Costa, N. C.; Seki, K.; Yunoki, S.; Sorella, S.. - In: COMMUNICATIONS PHYSICS. - ISSN 2399-3650. - 3:1(2020), pp. 1-6. [10.1038/s42005-020-0342-2]
Phase diagram of the two-dimensional Hubbard-Holstein model
Seki K.Membro del Collaboration group
;Yunoki S.Membro del Collaboration group
;Sorella S.
Supervision
2020-01-01
Abstract
The electron–electron and electron–phonon interactions play an important role in correlated materials, being key features for spin, charge and pair correlations. Thus, here we investigate their effects in strongly correlated systems by performing unbiased quantum Monte Carlo simulations in the square lattice Hubbard-Holstein model at half-filling. We study the competition and interplay between antiferromagnetism (AFM) and charge-density wave (CDW), establishing its very rich phase diagram. In the region between AFM and CDW phases, we have found an enhancement of superconducting pairing correlations, favouring (nonlocal) s-wave pairs. Our study sheds light over past inconsistencies in the literature, in particular the emergence of CDW in the pure Holstein model case.File | Dimensione | Formato | |
---|---|---|---|
s42005-020-0342-2.pdf
accesso aperto
Descrizione: DOAJ Open Access
Tipologia:
Versione Editoriale (PDF)
Licenza:
Creative commons
Dimensione
878.3 kB
Formato
Adobe PDF
|
878.3 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.