1. Among the numerous review papers dealing with hot carriers, we may cite: E. M. Conwell, high field transport in semiconductors, Solid State Phys., suppl. 9, Acad. Press, N.Y. (1967). M. Asche and O.G. Sarbei, Phys. Status Sol.33, 9 (1969).
2. W. Shockley, J.A. Copeland and R.P. James, Quantum theory of atoms, molecules and the solid state, P.O. Lowdin ed., Ac. Press (1966). Other definitions are available, among which given by K.M. Van Vliet and A. Van Der Ziel, Sol. State Electron.20, 231 (1977). It can be easily shown that.
3. P.J. Price, IBM. J. Res. Dev.3, 191 (1959)
4. P.J. Price, in “Fluctuation phenomena in solids”, chap. 8, ed. Burgess, Ac. Press. NY (1965).
5. J.P. Nougier, Phys. Status Sol.b55, K 43 (1973).