106
5 Mechanical Properties
Fig. 5.11 Phonon dispersion in BN (left panel), experimental data (symbols) and theory (solid lines, first principles
pseudopotential model). In the right panel the density of states is depicted. Adapted from [376]
A 1
E
E
T 2
(1)
T 2
(1)
T 2
(1)
T 2
(2)
T 2
(2)
T 2
(2)
Fig. 5.12 Displacement of atoms for various phonon modes in zincblende crystals. Adapted from [377]
displacement perpendicular to the c-axis are double degenerate such that there are nine modes (the
primitive unit cell has p = 4 atoms (Sect. 3.4.5)). The modes are labeled with their symmetry (in
molecular notation) according to group theory (see remark in Sect. 6.2.5).
5 Mechanical Properties
Fig. 5.11 Phonon dispersion in BN (left panel), experimental data (symbols) and theory (solid lines, first principles
pseudopotential model). In the right panel the density of states is depicted. Adapted from [376]
A 1
E
E
T 2
(1)
T 2
(1)
T 2
(1)
T 2
(2)
T 2
(2)
T 2
(2)
Fig. 5.12 Displacement of atoms for various phonon modes in zincblende crystals. Adapted from [377]
displacement perpendicular to the c-axis are double degenerate such that there are nine modes (the
primitive unit cell has p = 4 atoms (Sect. 3.4.5)). The modes are labeled with their symmetry (in
molecular notation) according to group theory (see remark in Sect. 6.2.5).