修改第一段

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2025-12-25 12:23:05 +08:00
parent 2b32c52d60
commit 8b269d067e
2 changed files with 24 additions and 19 deletions

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@@ -89,4 +89,6 @@ This was confirmed by the results under different polarization configurations an
对齐正入射、xyyx 使用 E23 对齐,其它则无法对齐,看情况处理。
只考虑了沿 zOx 平面入射的情况。
#include "figure-e1.typ"

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@@ -2,26 +2,29 @@
// 第一段:弱极性与强极性声子模式表现截然不同。如图所示,弱极性声子模式几乎不依赖于波矢方向,而强极性声子模式则表现出显著的各向异性。
Owing to the distinct behaviors arising from different electrical polarities of Raman-active phonon modes,
they were categorized into two groups:
negligible-polarity phonons (i.e., having zero or very weak electrical polarity),
and strong-polarity phonons.
The negligible-polarity phonons exhibited minimal dependence on the wavevector direction
(see the intersection of gray solid lines and orange dashed lines in @figure-discont b and c,
where the frequency only differed #sym.tilde 0.1 cm#super[-1] across different incidence configurations),
and were therefore usually analyzed at the #sym.Gamma point regardless of the incidence configurations;
specifically, there were eight such modes
labeled A#sub[1]-1 to A#sub[1]-2, E#sub[1]-1 to E#sub[1]-2, and E#sub[2]-1 to E#sub[2]-4,
according to their irreducible representations in the C#sub[6v] group and in order of increasing frequency.
In contrast, the strong-polarity phonons displayed significant anisotropy
(see the intersection of colored solid lines and orange dashed lines in @figure-discont b and c,
where the frequency differed #sym.tilde 10 cm#super[-1] across different incidence configurations),
and required analysis under specific incidence configurations.
In this paper, we focused on incidence within the zOx plane,
where three modes were present and named according to their vibration directions:
TO-zOx (vibrating in the zOx plane and roughly perpendicular to the incidence direction),
Raman-active phonon modes were categorized into two groups,
according to the distinct behaviors arising from different electrical polarities,
including eight negligible-polarity modes (i.e., having zero or very weak electrical polarity),
and three strong-polarity modes.
The negligible-polarity modes exhibited minimal dependence on the wavevector direction,
while the strong-polarity modes showed significant anisotropy.
This distinction was clearly illustrated in @figure-discont,
where the phonon dispersion relations of negligible-polarity modes (gray solid lines)
were roughly continuous and flat at the #sym.Gamma point,
leading to only #sym.tilde 0.1 cm#super[-1] frequency variations and similar vibration patterns
across different incidence configurations.
In contrast, the strong-polarity modes (colored solid lines) displayed discontinuities at the #sym.Gamma point,
resulting in #sym.tilde 1 cm#super[-1] frequency shifts and distinct different vibration patterns
under different incidence configurations.
Consequently, the negligible-polarity modes were named
according to their irreducible representations at the #sym.Gamma point and in order of increasing frequency,
including A#sub[1]-1 to A#sub[1]-2, E#sub[1]-1 to E#sub[1]-2, and E#sub[2]-1 to E#sub[2]-4.
In contrast, the strong-polarity modes were named according to their vibration directions and incidence configurations,
including TO-zOx (vibrating in the zOx plane and roughly perpendicular to the incidence direction),
TO-y (vibrating along the y-axis), and LO (vibrating roughly parallel to the incidence direction).
#include "figure-discont.typ"
In order to further investigate the frequencies dependence on the wavevector,
and to confirm the accuracy of both our experiments and calculations,
we analyzed the negligible-polarity phonons off the #sym.Gamma point
@@ -36,7 +39,7 @@ The E#sub[2]-3 peak served as a calibration reference under various experiments,
=== Negligible-polarity Phonons
#include "figure-discont.typ"
#include "figure-raman.typ"
Peaks corresponding to seven Raman-active negligible-polarity phonons were observed in our experiments