This article is cited in 12 papers

CONDENSED MATTER

Pseudogap in the spin-polaron approach for the carrier spectrum of a two-dimensional doped antiferromagnet

A. F. Barabanov, A. M. Belemuk

Institute for High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia

Abstract: In the Kondo model of the two-dimensional lattice with a strong spin-hole antiferromagnetic exchange, the pseudogap behavior of the carrier spectral function A(k, ω) is considered in the optimal and almost dielectric doping limits. A distinctive feature of the analysis is the introduction of the spin polaron even in the mean-field approximation that leads to the formation of two bands (the analogs of the upper and lower Hubbard bands) and makes it possible to immediately take into account the main rearrangement of A(k, ω). The inclusion of the scattering of the mean-field polaron (within the irreducible Green’s functions) describes the further rearrangement of A(k, ω), in particular, the unusual appearance of the pseudogap near the points N = (±π/2, ±π/2).

PACS: 71.38.+i, 74.20.Mn, 74.72.-h, 75.30.Mb, 75.50.Ee

Received: 14.04.2008

 English version: Journal of Experimental and Theoretical Physics Letters, 2008, 87:11, 628–632

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