T. Tanamoto et M. Ueda, INTERPLAY BETWEEN THE COULOMB-BLOCKADE AND RESONANT-TUNNELING STUDIEDBY THE KELDYSH-GREEN-FUNCTION METHOD, Physical review. B, Condensed matter, 57(23), 1998, pp. 14638-14641
A theory of tunneling through a quantum dot is presented that enables
us to study combined effects of the Coulomb blockade and the discrete
energy spectrum of the dot. The expression for the tunneling current i
s derived from the Keldysh Green's-function method, and is shown to sa
tisfy automatically the conservation of de current of both junctions.