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