调整图片

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2025-05-05 12:06:53 +08:00
parent 311aaf7df7
commit ea6aba9f47
6 changed files with 32 additions and 20 deletions

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@@ -1,7 +1,12 @@
#import "@preview/starter-journal-article:0.4.0": article, author-meta
#import "@preview/tablem:0.2.0": tablem
#set par.line(numbering: "1")
#show figure.caption: it => {
set align(left)
set text(10pt)
show: box.with(width: 80%)
it
}
#show: article.with(
title: "Article Title",
authors: (
@@ -56,7 +61,7 @@ They could be probed by various experimental techniques,
Among these techniques,
Raman spectroscopy is the most commonly used method,
as it provides non-destructive, non-contact, rapid and spatially localized measurement of phonons
that near the $Gamma$ point in reciprocal space.
that near the #sym.Gamma point in reciprocal space.
Studies in Raman scattering of 4H-SiC have been conducted since as early as 1983
and have been widely employed to identification of different SiC polytypes.
@@ -86,18 +91,25 @@ In this paper, we do some things. We do something for the first time.
// 拉曼活性的声子模式对应于 Gamma 点附近的声子模式。
// 根据这些声子模式的极性,我们将这些声子分成两类。
Raman scattering peeks correspond to phonons located near the $Gamma$ point in reciprocal space.
Raman scattering peeks correspond to phonons located near the #sym.Gamma point in reciprocal space.
We classified these phonons into two categories based on their polarities:
(i) negligible-polar phonons (i.e., phonons with no polarity or very weak polarity),
whose dispersion curves are continuous near the Γ point (as shown in @phonon),
whose dispersion curves are continuous near the #sym.Gamma point (as shown in @phonon),
and for which the effect of polarity can be ignored in the Raman scattering process;
and (ii) strong-polar phonons,
whose dispersion curves exhibit discontinuity near the Γ point (also shown in @phonon),
whose dispersion curves exhibit discontinuity near the #sym.Gamma point (also shown in @phonon),
where the polarity gives rise to observable effects in the Raman spectra.
#figure(
image("/画图/声子不连续/整体图.svg", width: 80%),
caption: [Weak- and None-polarized phonons near $Gamma$ point],
image("/画图/声子不连续/main.svg"),
caption: [
(a) Phonon dispersion of 4H-SiC along the A#sym.GammaK high-symmetry path.
Gray lines represent negligible-polar phonon modes,
while colored lines indicate strong-polar phonon modes.
(b) Magnified view of the boxed region in (a).
The orange dashed lines mark the phonon wavevectors involved in Raman scattering
with incident light along the z- and y-directions.
],
placement: none
)<phonon>
@@ -108,16 +120,16 @@ We classified these phonons into two categories based on their polarities:
// 尽管拉曼过程中起作用的声子并不是那些严格在 Gamma 点的,
// 但这些声子模式的散射谱在 Gamma 附近连续且导数为零,且波矢很小(在本文中大约 0.01 A只有c轴的大约2%)。
// 因此,它们的性质与 Gamma 点的声子模式区别不大。
Phonons at the $Gamma$ point were used
Phonons at the #sym.Gamma point were used
to approximate negligible-polar phonons that participating in Raman processes.
This approximation is widely adopted and justified by the fact that,
although the phonons participating in Raman processes are not these strictly located at the $Gamma$ point,
their dispersion near the $Gamma$ point is continuous with vanishing derivatives,
although the phonons participating in Raman processes are not these strictly located at the #sym.Gamma point,
their dispersion near the #sym.Gamma point is continuous with vanishing derivatives,
and their wavevector is very small
(about 0.01 AA in this paper, which corresponds to only 2% of the smallest reciprocal lattice vector of 4H-SiC).
// TODO: 确认这个数值
Therefore, negligible-polar phonons involved in Raman processes
have nearly indistinguishable properties from those at the $Gamma$ point.
have nearly indistinguishable properties from those at the #sym.Gamma point.
// 4H-SiC 在 Gamma 有 21 个distinct phonons其中极性较弱的有 18 个。这些模式对应于点群 $\mathrm{C_{6v}}$ 的 12 个表示($\mathrm{3A_1+4B_1+3E_1+4E_2}$。
// 对于非极性声子的拉曼散射,我们将使用 Gamma 点的声子模式来近似描述。

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