Metal–insulator transition in Honeycomb lattice due to electronic correlation

The role of electronic correlation in metallicity and insulating behavior of Honeycomb (HC) lattice is investigated via the Hubbard model. It is shown that the HC lattice suffers an evolution from an ionic band insulator to a metal on increasing the electronic interaction, U. There is no critical va...

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Bibliographic Details
Published inPhysica. B, Condensed matter Vol. 430; pp. 36 - 39
Main Authors Fathi, M.B., Tehranchi, M.M.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier B.V 01.12.2013
Elsevier
Subjects
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Correlation
DMFT
Electron states
Electronics
Exact sciences and technology
Honeycomb
Honeycomb lattice
Hubbard model
Insulators
IPT solver
Lattices
Metal-insulator transitions and other electronic transitions
Physics
Singularities
Hubbard model
IPT solver
Honeycomb lattice
DMFT
Honeycomb lattices
Kondo effect
Mott insulating
Van Hove singularity
Metal-insulator transition
Electron interaction
Electronic density of states
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Summary:The role of electronic correlation in metallicity and insulating behavior of Honeycomb (HC) lattice is investigated via the Hubbard model. It is shown that the HC lattice suffers an evolution from an ionic band insulator to a metal on increasing the electronic interaction, U. There is no critical value Uc1 for onset of metallic state and each of two common van Hove singularities splits into two extra singularities. The metallic state is enhanced with further increasing the interaction strength U, and the characteristic Kondo peak develops. The height of Kondo peak completely vanishes at U≃6.15t, and then a Mott insulator develops at Uc2≃6.5t.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2013.08.023