Let fR (tR ) [fL (tL )] be the PDF of the ﬁrst passage time tR [tL ] respectively.
A Random Walk to a Non-Ergodic Equilibrium Concept
Once, we have evaluated Wph (E ) and Dj F (E ), we have to calculate the integral in Eq.(5) to obtain the two DF, fl (E ) and ftr (E ), corresponding to the l-tr valleys respectively.
High-field transport properties of bulk Si: A test for the Fokker-Planck approach