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Cumulant approach to the coherent hole motion in the tz.sbnd;J model

✍ Scribed by K.W. Becker; R. Eder; H. Won

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
269 KB
Volume
185-189
Category
Article
ISSN
0921-4534

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✦ Synopsis

We discuss the motion of a hole generated in the Cu -0 plane in high temperature superconductors at half-t~Aling.

The system is described by the t -J model. It is shown that spin fluctuations in the ground state reduce the bandwidth of the excitation energy as compared to the motion within the N6el ground state. The calculations axe based on a recently introduced cumulant approach to dynamical correlation functions. This approach allows for a proper treatment of the strong electronic correlations. It also guarantees that only spin fluctuations 'connected' to the hole motion can contribute to the physical quantities.

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