## Introduction to Solid State Physics |

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Page 289

It is surprising that any good at all comes out of an approach in terms of external

forces alone, but we shall see that the

From (11.37) we have (11.42) de,/dt = h ' d'E/dkdt = h '(d°E /d/;”)(dk/dl).

It is surprising that any good at all comes out of an approach in terms of external

forces alone, but we shall see that the

**effective mass**is a most useful quantity.From (11.37) we have (11.42) de,/dt = h ' d'E/dkdt = h '(d°E /d/;”)(dk/dl).

Page 293

Although k is increased by Ak by the applied electric field, the consequent Bragg

reflections result in an overall decrease in the momentum of the electron, so that

the

Although k is increased by Ak by the applied electric field, the consequent Bragg

reflections result in an overall decrease in the momentum of the electron, so that

the

**effective mass**may be described as being negative. As we proceed from E ...Page 317

The

calculated by Brooks:” Li Na ... have nearly the free electron mass, so that sodium

in some respects may be expected to behave like an ideal free electron gas.

The

**effective masses**of the conduction electrons in the alkali metals have beencalculated by Brooks:” Li Na ... have nearly the free electron mass, so that sodium

in some respects may be expected to behave like an ideal free electron gas.

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absorption acceptors alkali alloys approximately atoms axis barium titanate boundary Bragg Brillouin zone calculated chapter charge conduction band conduction electrons crystal structure cube cubic Curie point Debye density dielectric constant diffraction diffusion dipole direction discussion dislocation distribution domain effective mass elastic electric field energy equation equilibrium exciton experimental F centers factor Fermi ferroelectric ferromagnetic free electron frequency germanium given heat capacity hexagonal holes impurity interaction ionization ions lattice constant lattice point low temperatures magnetic field magnetic moment metals molecules motion nearest neighbor normal observed p-n junction paramagnetic particles phonons Phys physics plane polarizability polarization positive potential Proc region resonance result room temperature rotation semiconductor Shockley shown in Fig sodium chloride solid solution space group specimen spin superconducting surface susceptibility symmetry Table theory thermal tion transition unit volume vacancies valence band values vector velocity wave functions wavelength zero