## Introduction to Solid State Physics |

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Page 3

TWO-DIMENSIONAL CRYSTALS The general two-dimensional

Fig. 1.2 is an infinite array of

every

apparent ...

TWO-DIMENSIONAL CRYSTALS The general two-dimensional

**lattice**shown inFig. 1.2 is an infinite array of

**points**. The**points**obey the**lattice**condition thatevery

**point**should have the same environment in the same orientation. It isapparent ...

Page 6

The first position refers to the rotation about the point: thus the point group 4

contains 4-fold rotations. The second ... It is easily seen that this is invariant under

a rotation 21/6 about an axis through a

The first position refers to the rotation about the point: thus the point group 4

contains 4-fold rotations. The second ... It is easily seen that this is invariant under

a rotation 21/6 about an axis through a

**lattice point**and normal to the plane.Page 9

THE FIVE Two-DIMENsion AL BRAvA is

Conventional Corresponding Corresponding about Lattice Lattice Unit Cell Axes

System Points Oblique Parallelogram a z b, y z 90° Oblique 1, 2 Primitive cool" ...

THE FIVE Two-DIMENsion AL BRAvA is

**LATTICES Point**-Group SymmetryConventional Corresponding Corresponding about Lattice Lattice Unit Cell Axes

System Points Oblique Parallelogram a z b, y z 90° Oblique 1, 2 Primitive cool" ...

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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