Titolo: Filled band Fermi systems
Autori: F. Bonetto, V. Mastropietro
Archiviato: in mp_arc #95-360;
in http://chimera.roma1.infn.it;
Abstract: Extending the result in (B.M.) on one dimensional
interacting fermions in a periodic potential we study the
infrared behaviour of the two points Schwinger function in the
filled band case. If the fermions are spinless such behaviour
is completely determined and it depends on the ratio between
the amplitude of the gap and the strength of the
interaction. If the ratio is large the Schwinger function
behaviour is similar to the one in the free non interacting
case while if it is small the Schwinger function is deeply
modified and it depends on two anomaly indices, in term of
which the occupation number discontinuity and the spectral gap
are expressed. A heuristic second order analysis of the
spinning case is also performed.
Indirizzi:
Matematica, Universita' di Roma La Sapienza, P.le Moro 2, 00185,
Roma, Italia. e-mail bonetto@ipparco.roma1.infn.it
Matematica, Universita' di Roma Tor Vergata V. Fontanile di
Carcaricola, 00133, Roma, Italia e-mail
vieri@ipparco.roma1.infn.it