G. Chiappe et al., RECOVERY OF THE PERSISTENT CURRENT-INDUCED BY THE ELECTRON-ELECTRON INTERACTION IN MESOSCOPIC METALLIC RINGS, Solid state communications, 99(10), 1996, pp. 717-721
Persistent currents in mesoscopic metallic rings induced by static mag
netic fields are investigated by means of a Hamiltonian which incorpor
ates diagonal disorder and the electron-electron interaction through a
Hubbard term (U). Correlations are included up to second order pertur
bation theory which is shown to work accurately for U of the order of
the hopping integral. If disorder is not very strong, interactions inc
rease the current up to near its value for a clean metal. Averaging ov
er ring lengths eliminates the first Fourier component of the current
and reduces its value, which remains low after interactions are includ
ed. Copyright (C) 1996 Elsevier Science Ltd.