Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-10-19
Eur.Phys.J B 22, (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 7 EPS figures included, extended version
Scientific paper
10.1007/PL00011135
We represent the generators of the SU(N) algebra as bilinear combinations of Fermi operators with imaginary chemical potential. The distribution function, consisting of a minimal set of discrete imaginary chemical potentials, is found for arbitrary N. This representation leads to the conventional temperature diagram technique with standard Feynman codex, except that the Matsubara frequencies are determined by neither integer nor half-integer numbers. The real-time Schwinger-Keldysh formalism is formulated in the framework of complex distribution functions. We discuss the continuous large N and SU(2) large spin limits. We illustrate the application of this technique for magnetic and spin-liquid states of the Heisenberg model.
Feldmann Heiko
Kiselev Michael N.
Oppermann Reinhold
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