Single-hole properties of the t-J model on the honeycomb lattice

Abstract

Motivated by the possible charge ordering in the recently discovered superconductor Na_xCoO_2 yH_2O, which at filling x=1/3 would correspond to a half-filled honeycomb lattice, we investigate the single-hole dynamics of the t-J model on this lattice. Using exact diagonalization, series expansion and the self-consistent Born approximation, we calculate the quasi-particle dispersion, bandwidth and residues and compare our findings with the well established results for the square lattice. Given the similarities between both lattices, it is not surprising that we find qualitatively similar features for the honeycomb lattice, namely an almost flat band along the edge of the magnetic Brillouin zone and well defined hole pockets around the corners. However, we report a considerable disagreement between the three methods used concerning the bandwidth and discuss possible origins of this discrepancy.

arXiv comment11 pages, 10 figures

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Cited by in corpus (11)

• Hidden Quasiparticles and Incoherent Photoemission Spectra in Na2IrO3
• Hole propagation in the Kitaev-Heisenberg model: From quasiparticles in quantum Neel states to non-Fermi liquid in the Kitaev phase
• Loop-Cluster Simulation of the $t$-$J$ Model on the Honeycomb Lattice
• Phonons and the coherence scale of models of heavy fermions
• Systematic Effective Field Theory Investigation of Spiral Phases in Hole-Doped Antiferromagnets on the Honeycomb Lattice
• Spin polaron in the J1-J2 Heisenberg model
• Single-hole spectra of Kitaev spin liquids: from dynamical Nagaoka ferromagnetism to spin-hole fractionalization
• Spin excitations and thermodynamics of the t-J model on the honeycomb lattice
• Dynamics of a single hole in the Heisenberg-Kitaev model: a self-consistent Born approximation study
• Pairing tendencies in the doped Kitaev-Heisenberg model
• Spectrum of the hole excitation in spin-orbit Mott insulator Na${}_2$IrO${}_3$