6533b861fe1ef96bd12c4db6
RESEARCH PRODUCT
Single-particle properties of the Hubbard model in a novel three-pole approximation
Andrea Di CioloAdolfo Avellasubject
Hubbard modelSingle-particle propertiesField (physics)Hubbard modelThree-pole approximationVan Hove singularityFOS: Physical sciences02 engineering and technology01 natural sciencesCondensed Matter - Strongly Correlated ElectronsQuantum mechanicsCondensed Matter::Superconductivity0103 physical sciencesCuprateElectrical and Electronic Engineering010306 general physicsSpin-½PhysicsCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)Strongly correlated electron systemsFermi surface021001 nanoscience & nanotechnologyCondensed Matter PhysicsComposite Operator MethodElectronic Optical and Magnetic MaterialsComposite Operator Method; Hubbard model; Operatorial approach; Single-particle properties; Strongly correlated electron systems; Three-pole approximation;Operatorial approachStrongly correlated materialCondensed Matter::Strongly Correlated Electrons0210 nano-technologyPseudogapdescription
We study the 2D Hubbard model using the Composite Operator Method within a novel three-pole approximation. Motivated by the long-standing experimental puzzle of the single-particle properties of the underdoped cuprates, we include in the operatorial basis, together with the usual Hubbard operators, a field describing the electronic transitions dressed by the nearest-neighbor spin fluctuations, which play a crucial role in the unconventional behavior of the Fermi surface and of the electronic dispersion. Then, we adopt this approximation to study the single-particle properties in the strong coupling regime and find an unexpected behavior of the van Hove singularity that can be seen as a precursor of a pseudogap regime.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-11-11 |