A new field-theoretical formulation for the motion of an electron in a quenched disorder potential

Details A new field-theoretical formulation for the motion of an electron in a quenched disorder potential A new field-theoretical formulation for the motion of an electron in a quenched disorder potential

1996-06-25

arxiv.org/abs/cond-mat/9606185v1

Physics

Condensed Matter

5 pages, Latex 2.09 with Pictex

Scientific paper

Following a proposal by Aronov and Ioselevich, we express the Green functions (GF) of a noninteracting disordered Fermi system as a functional integral on a real time/frequency lattice. The normalizing denominator of this functional integral is equal to unity, because of identities satisfied by the GF. The GF can then be simply averaged with respect to the random disorder potential. We describe the fermionic fields not belonging to the external frequency by means of a bosonic auxiliary field g. The Hubbard-Stratonovich field Q is introduced only with respect to the fermionic fields for the external frequency.

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