SEMI-FERMIONIC REPRESENTATION FOR SPIN SYSTEMS UNDER EQUILIBRIUM AND NON-EQUILIBRIUM CONDITIONS
نویسندگان
چکیده
منابع مشابه
Semi-fermionic Representation for Spin Systems under Equilibrium and Non-equilibrium Conditions
We present a general derivation of semi-fermionic representation for spin operators in terms of a bilinear combination of fermions in real and imaginary time formalisms. The constraint on fermionic occupation numbers is fulfilled by means of imaginary Lagrange multipliers resulting in special shape of quasiparticle distribution functions. We show how Schwinger-Keldysh technique for spin operato...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics B
سال: 2006
ISSN: 0217-9792,1793-6578
DOI: 10.1142/s0217979206033310