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+== Phonons in Perfect 4H-SiC
+
+总共有 21 个声子模式。我们把它分成 18 个极性很小的和 3 个极性很强的两类。
+
+// There are 21 phonons in total.
+// We classified them into two categories: 18 negligible-polar phonons and 3 strong-polar phonons.
+The phonons involved in Raman scattering are located in reciprocal space around the #sym.Gamma point,
+  and the exact positions are determined by the wavevectors of the incident and scattered light.
+At each such position, there are 21 phonon modes (degenerate modes are counted as their multiplicity).
+We classify these 21 phonons into two categories based on their polarities.
+The 18 of 21 phonons are classified into negligible-polar phonons (i.e., phonons with zero or very weak polarity),
+    for which the effect of polarity can be ignored in the Raman scattering process;
+  and the other three phonons are strong-polar phonons,
+    where the polarity gives rise to observable effects in the Raman spectra.
+
+这个分类是有意义的。从微观上讲，它也和原子的振动方向有关。
+
+// This classification make sense.
+This classification is based on the fact that
+  the four Si atoms in the primitive cell of 4H-SiC carry similar positive Born effective charges (BECs),
+  and the four C atoms carry similar negative BECs (see @table-bec).
+In the 18 negligible-polar phonons,
+  the vibrations of two Si atoms are approximately opposite to those of the other two Si atoms,
+  and the same holds for the C atoms,
+  leading to cancellations of macroscopic polarity.
+In contrast, in the three strong-polar phonons,
+  all Si atoms vibrate in the same direction, and all the C atoms vibrate in the opposite direction,
+  resulting in a strong dipole moment.
+
+#include "table-bec.typ"
+
+#include "non-polar/default.typ"
+#include "polar/default.typ"