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Journal of Physics C Solid State Physics

Fermion-field theory and configuration averaging. III. Off-diagonal disorder and bond CPA

Abhijit Mookerjee

Published Sep 21, 1975• 14 citations
Publisher

Abstract

For pt.II, see ibid., vol.8, no.1, p.2688 (1975). The problem of off-diagonal disorder is analysed in the fermion-field picture of configuration averaging. The idea of bond-CPAS reported earlier in this series is studied in detail.
DOI
10.1088/0022-3719/8/18/014

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For pt.II see ibid., vol.9, p.479 (1976). An earlier study of the conventional nearest-neighbour Ising model on the tetrahedron lattice is extended to include four-spin interactions about each tetrahedron. The problem of deriving high-temperature susceptibility series can be converted into a form for which previous graphical techniques can be readily applied. Analysis of the series by Pade approximants and the ratio method suggests that the exponent gamma has the constant value of 1.25 independent of the strength of the four-spin coupling, in agreement with universality.
For pt.II see ibid., vol.9, p.1221 (1976). Discusses the steady-state response of a three-level atom in two-photon absorption. The applied laser fields can have arbitrary intensities (within the rotating-wave approximation (RWA)). A general expression is derived for the population excited on the uppermost energy level. Two special cases which allow a trivial Doppler averaging are treated in detail. For an off-resonant intermediate state the two-photon spectrum is a simple Lorentzian showing a power shift and modest cross power broadening. The same features are retained when several off-resonance intermediate levels are assumed. For very strong laser fields the Doppler shifts can be neglected in the first approximation. The corresponding spectra are analysed.