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Article: Theoretical prediction of fragile Mott insulators on plaquette Hubbard lattices

TitleTheoretical prediction of fragile Mott insulators on plaquette Hubbard lattices
Authors
Issue Date2015
PublisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2015, v. 91 n. 12, article no. 125128 How to Cite?
Abstract© 2015 American Physical Society. Employing extensive cellular dynamical mean-field theory calculations with an exact diagonalization impurity solver, we investigate the ground-state phase diagrams and nonmagnetic metal-insulator transitions of the half-filled Hubbard model on two plaquette (the 1/5 depleted and checkerboard) square lattices. We identify three different insulators in the phase diagrams: dimer insulator, antiferromagnetic insulator, and plaquette insulator. We also demonstrate that the plaquette insulator is a novel fragile Mott insulator (FMI) which features a nontrivial one-dimensional irreducible representation of the C4v crystalline point group and cannot be adiabatically connected to any band insulator with time-reversal symmetry. Furthermore, we study the nonmagnetic quantum phase transitions from the metal to the FMI and find that this Mott metal-insulator transition is characterized by the splitting of the noninteracting bands due to interaction effects.
Persistent Identifierhttp://hdl.handle.net/10722/268566
ISSN
2014 Impact Factor: 3.736
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWu, Han Qing-
dc.contributor.authorHe, Rong Qiang-
dc.contributor.authorMeng, Zi Yang-
dc.contributor.authorLu, Zhong Yi-
dc.date.accessioned2019-03-25T08:00:05Z-
dc.date.available2019-03-25T08:00:05Z-
dc.date.issued2015-
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2015, v. 91 n. 12, article no. 125128-
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10722/268566-
dc.description.abstract© 2015 American Physical Society. Employing extensive cellular dynamical mean-field theory calculations with an exact diagonalization impurity solver, we investigate the ground-state phase diagrams and nonmagnetic metal-insulator transitions of the half-filled Hubbard model on two plaquette (the 1/5 depleted and checkerboard) square lattices. We identify three different insulators in the phase diagrams: dimer insulator, antiferromagnetic insulator, and plaquette insulator. We also demonstrate that the plaquette insulator is a novel fragile Mott insulator (FMI) which features a nontrivial one-dimensional irreducible representation of the C4v crystalline point group and cannot be adiabatically connected to any band insulator with time-reversal symmetry. Furthermore, we study the nonmagnetic quantum phase transitions from the metal to the FMI and find that this Mott metal-insulator transition is characterized by the splitting of the noninteracting bands due to interaction effects.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/-
dc.relation.ispartofPhysical Review B (Condensed Matter and Materials Physics)-
dc.titleTheoretical prediction of fragile Mott insulators on plaquette Hubbard lattices-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevB.91.125128-
dc.identifier.scopuseid_2-s2.0-84926513117-
dc.identifier.volume91-
dc.identifier.issue12-
dc.identifier.spagearticle no. 125128-
dc.identifier.epagearticle no. 125128-
dc.identifier.eissn1550-235X-
dc.identifier.isiWOS:000352142300003-
dc.identifier.issnl1098-0121-

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