Gapless quantum spin liquid, stripe and antiferromagnetic phases in frustrated Hubbard models in two dimensions
| dc.creator | Mizusaki, Takahiro | |
| dc.creator | Imada, Masatoshi | |
| dc.date | 2006-04-16 | |
| dc.date | 2006-06-14 | |
| dc.date.accessioned | 2026-07-07T07:05:33Z | |
| dc.date.available | 2026-07-07T07:05:33Z | |
| dc.description | Unique features of non-magnetic insulator phase are shown, and phase diagram for t-t' Hubbard model on square lattice is presented. Using the path-integral renormalization group method, we find antiferromagnetic phase for small next-nearest neighbor transfer t' and stripe (or collinear) phase for large t' in the Mott insulating region of strong on site interaction U. For intermediate t'/t~ 0.7 at large U/t>7, we find longer-period antiferromagnetic insulator phase with 2*4 structure. In the Mott insulating region, we also find quantum spin liquid (in other words, non-magnetic insulator) phase near the Mott transition to paramagnetic metals. Correlated electrons often crystallize to the Mott insulator usually with some magnetic orders, whereas the "quantum spin liquid" has been a long-sought issue. We report numerical evidences that a nonmagnetic insulating (NMI) phase gets stabilized near the Mott transition with remarkable properties: The 2D Mott insulators on geometrically frustrated lattices contain a phase with gapless spin excitations and degeneracy of the ground state in the whole Brillouin zone of the total momentum. It has an interpretation for an unexplored type of a quantum liquid. The present concept is useful in analyzing a variety of experimental results in frustrated magnets including organic BEDT-TTF compounds and 3He atoms adsorbed on graphite. | |
| dc.description | Manuscript was updated | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0604389 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0604389 | |
| dc.identifier | Phys. Rev. B 74, 014421 (2006) | |
| dc.identifier | doi:10.1103/PhysRevB.74.014421 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/109706 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Gapless quantum spin liquid, stripe and antiferromagnetic phases in frustrated Hubbard models in two dimensions | |
| dc.type | text |