2005/12/31 by Andreas Lüscher, Andreas Luscher, Andreas M. Läuchli +4 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Brillouin zone #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Ising model #Lattice (music) #Lattice energy #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #Quasiparticle #Square lattice #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.73.155118
published as Phys. Rev. B 73, 155118 (2006) · 11 pages, 10 figures
arxiv created 2006/02/21 · openalex publication_date 2006/04/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Motivated by the possible charge ordering in the recently discovered superconductor NaxCoO2\phantom\rule0.2em0exyH2O, which at filling x=1∕3 would correspond to a half-filled honeycomb lattice, we investigate the single-hole dynamics of the t\text\ensuremath-J model on this lattice. Using exact diagonalization, series expansion, and the self-consistent Born approximation, we calculate the quasiparticle dispersion, bandwidth, and residues and compare our findings to 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.