## Proceedings of the International School of Physics "Enrico Fermi.", Volume 22N. Zanichelli, 1963 - Nuclear physics |

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Page 5

It will be proved in Section 4 that also in the general case hk has many of the

properties of

equal, though, to the average value of

all ...

It will be proved in Section 4 that also in the general case hk has many of the

properties of

**momentum**and can thus be called « crystal**momentum**». It is notequal, though, to the average value of

**momentum**. The energy of a state y>k is toall ...

Page 198

In either approach we wish to find the average

in the field direction, which determines the current, by equating the rate of gain of

In either approach we wish to find the average

**momentum**of the electron (holes)in the field direction, which determines the current, by equating the rate of gain of

**momentum**from the field to the rate of randomization of**momentum**to the lattice ...Page 202

situations. 2. - Scattering processes.

by electrons is often loosely ascribed to « collisions ». There is no objection to

this ...

**momentum**than energy. Nevertheless, eq. (2.6) can be very useful in somesituations. 2. - Scattering processes.

**Momentum**randomization.**Momentum**lossby electrons is often loosely ascribed to « collisions ». There is no objection to

this ...

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absorption acceptor approximation assumed band edge band structure Brillouin zone calculated carrier centre charge Chem coefficient components compound concentration conduction band consider constant corresponding crystal curves cyclotron resonance degenerate density diffusion direct transition discussed donor doping effective mass electric field energy gap energy surfaces equation equilibrium example exciton experimental expression Faraday rotation foreign atoms free electron frequency germanium given hence holes imperfections impurity indium antimonide InSb interaction interband ionization ions Journ lattice levels linear liquid magnetic field matrix measurements melt mobility momentum obtained optical p-type phonon Phys potential pressure quantum range reciprocal lattice region samples scattering semiconductors shown in Fig spherical spin spin-orbit structure elements symmetry tensor theory thermodynamic thermodynamic potentials tion transverse valence band valley Voigt effect wave functions wave vector Zeeman effect zero zone