Charge correlations and optical conductivity in weakly doped antiferromagnets

Details Charge correlations and optical conductivity in weakly doped antiferromagnets Charge correlations and optical conductivity in weakly doped antiferromagnets

1997-05-29

arxiv.org/abs/cond-mat/9705296v1

Europhys. Letters 38, 607 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures, to appear in Europhys. Letters

Scientific paper

10.1209/epl/i1997-00291-y

We investigate the dynamical charge-charge correlation function and the optical conductivity in weakly doped antiferromagnets using Mori-Zwanzig projection technique. The system is described by the two-dimensional t-J model. The arising matrix elements are evaluated within a cumulant formalism which was recently applied to investigate magnetic properties of weakly doped antiferromagnets. Within the present approach the ground state consists of non-interacting hole quasiparticles. Our spectra agree well with numerical results calculated via exact diagonalization techniques. The method we employ enables us to explain the features present in the correlation functions. We conclude that the charge dynamics at weak doping is governed by transitions between excited states of spin-bag quasiparticles.

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