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Excitation spectrum of correlated Dirac fermions

Jalali, Z ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. Publisher: Institute of Physics Publishing , 2015
  3. Abstract:
  4. Motivated by the puzzling optical conductivity measurements in graphene, we speculate on the possible role of strong electronic correlations on the two-dimensional Dirac fermions. In this work we employ the slave-particle method to study the excitations of the Hubbard model on honeycomb lattice, away from half-filling. Since the ratio U/t ≈ 3.3 in graphene is not infinite, double occupancy is not entirely prohibited and hence a finite density of doublonscan be generated. We therefore extend the Ioff-Larkin composition rule to include a finite density of doublons. We then investigate the role played by each of these auxiliary particles in the optical absorption of strongly correlated Dirac fermions
  5. Keywords:
  6. Electromagnetic wave absorption ; Honeycomb structures ; Light absorption ; Optical conductivity ; Composition rule ; Dirac fermions ; Excitation spectrum ; Finite density ; Honeycomb lattices ; Optical conductivity measurements ; Particle methods ; Strong electronic correlations ; Graphene
  7. Source: Journal of Physics: Conference Series, 14 January 2015 through 15 January 2015 ; Volume 603, Issue 1 , January , 2015 ; 17426588 (ISSN)
  8. URL: http://iopscience.iop.org/article/10.1088/1742-6596/603/1/012005/meta