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10. Appendix

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774 Subject Index<br />

Triple spectrometers 386<br />

Tunable cw lasers 372<br />

– dye laser 420<br />

– IR laser 572<br />

Tunnel diode 525<br />

Tunneling 473, 525, 567<br />

Two-dimensional crystals 445, 574<br />

Two-dimensional critical points (see also van<br />

Hove singularities) 266<br />

Two-dimensional exciton 291<br />

Two-phonon absorption 302<br />

– spectra of Si and Ge 301<br />

Two-phonon Raman scattering 377<br />

– Ge 390, 391<br />

– Si 390<br />

Two-thirds rule for spin-orbit splitting 266<br />

Type I and type II MQW’s 478<br />

– type IIA 478<br />

– type IIB 478<br />

Type I and type II superlattice 478<br />

– type IIA 478<br />

– type IIB 478<br />

Type III MQW’s and superlattices 478, 479<br />

U<br />

Ultrahigh vacuum 8, 248, 433<br />

Ultra-pure germanium 555<br />

Ultraviolet photoemission spectroscopy (UPS)<br />

9, 428, 436<br />

– effect of band bending 463<br />

– spectrum of III–V compounds 443<br />

Umklapp process 216<br />

Uncertainty principle 161<br />

Uniaxial crystals 246<br />

Uniaxial stress 138<br />

Unit element 25<br />

Units (see inside covers)<br />

– frequency of electromagnetic waves 247<br />

– pressure 434<br />

V<br />

Vacancies 160, 182<br />

– binding energy 192<br />

– in diamond- or zincblende-type 183<br />

Vacuum level 438<br />

Vacuum ultraviolet 422<br />

Valence band<br />

– dispersion in GaAs/AlGaAs QW's as determined<br />

by hot luminescence 493<br />

– extrema 126<br />

– Ge determined by UPS 449<br />

– parameters A, B, C 81<br />

– parameters of diamond and zincblende semiconductor<br />

75<br />

Valence electrons 18, 59<br />

Valence force field method 116<br />

– force constants 115<br />

Valence plasmons 430<br />

– in GaP 430<br />

Valley-orbit coupling 171, 311<br />

Valley-orbit splitting of donor levels 173<br />

Van der Pauw method 234–236<br />

Van der Waals interaction 3, 356, 445<br />

Van Hove singularities 261, 262, 267, 325, 336,<br />

566<br />

– in  i 262<br />

– in one, two, and three dimensions 263<br />

Van Roosbroek-Shockley relation 348<br />

Vapor-phase epitaxial growth 332<br />

Variational technique for impurity levels 172<br />

Velocity overshoot 226<br />

Velocity saturation 226–228<br />

Vertex in Feynman diagrams 395<br />

Vertical transition 259<br />

Vibrational properties of semiconductors 107<br />

Videotelephony 574<br />

Virtual crystal approximation 193<br />

Virtual crystal potential 192<br />

Virtual transitions 271, 327<br />

Volmer-Weber growth 11<br />

Volume deformation potential 125, 238<br />

– tight-binding model 148<br />

Volume dilation 124<br />

Von Klitzing constant 576<br />

W<br />

Wannier excitons 276, 281<br />

– absorption spectrum 336<br />

Wannier functions 162, 279<br />

Wannier-Mott excitons 277<br />

Warm carriers 227<br />

Wave nature of electron 574<br />

Wave vectors 21<br />

Wavenumber 247<br />

Wetting layer 11<br />

Work function 438<br />

Wurtzite crystal<br />

– acoustic phonons 147<br />

– electromechanical tensor elements 132<br />

– piezoelectric electron-phonon interactions 156<br />

– phonons 145<br />

– stiffness tensor 144

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