(107) |
current from L region is
(108) |
(109) | |||
(110) | |||
(111) |
Define Keldysh Green functions
(113) | |||
(114) | |||
(115) |
Dyson equation,
, reads
(118) |
The second term reads
(119) |
The (2,1) component of eq.(118) gives
(120) |
(121) |
For non equilibrium Green functions,
time dependence of
(123) |
In the stochastic approximation,
Use eq.(123), eq.(125) and eq.(126)
(130) |
(131) |
(132) |
(133) |
Therefore
(134) |