Spectral behavior of the electronic states of bilayer cuprate systems using a slave fermion approach

Lal, Govind Ratan ; Joshi, S. K. (2004) Spectral behavior of the electronic states of bilayer cuprate systems using a slave fermion approach Physical Review B, 69 (9). 094522_1-094522_9. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v69/i9/e094522

Related URL: http://dx.doi.org/10.1103/PhysRevB.69.094522

Abstract

The spectral function for electrons in the normal state of a bilayer cuprate is calculated by employing a slave fermion approach. The electron correlations in the CuO2 layers in these cuprates are described by a t-J model, and the electronic coupling between the two CuO2 layers within the same unit cell is introduced via a hopping matrix element (t) and an exchange interaction (J). The spectral function is calculated for different values of the hole concentration, temperature, and anisotropy at various values of the momentum (kx,ky). It is found that the bilayer coupling (t) significantly affects the behavior of the spectral function. The spectral function around the momentum value (π, 0) for a coupled bilayer cuprate shows a peak much sharper than that for a system of uncoupled layers. Our calculation also suggests a splitting of electronic states of the bilayer cuprates along the (π, 0) direction for the heavily overdoped regime. Calculations of the imaginary part of the self-energy Σ1'(k,ω) for a bilayer system have also been presented. It is found that Σ1'(k,ω) depends strongly on the momentum and shows a ωα dependence on energy with 1.2<α<1.5 for values of the parameters t and J considered in the present calculations.

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