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@@ -9,7 +9,7 @@
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同时,我们定义 a 轴与 x 轴平行,b 轴与 a 轴夹角为 120 度。
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在此定义下,晶圆的切边沿 x 方向(即 [$11 overline(2) 0$] 方向),
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台阶流外延过程中台阶台阶边沿平行于 y 方向(即 [$1 overline(1) 00$] 方向),生长方向为 x 方向(即 [$11 overline(2) 0$])。
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此定义与 material projects 数据库以及大部分文献中的定义一致,而与其它一些文献中的定义不一致。
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此定义与 material projects 数据库以及大部分文献中的定义一致,而与其它一些文献和数学教科书中的定义不同,因此在使用时需要仔细确认。
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(最后一行补充参考文献)。
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The axes in our study need to be clearly defined due to the anisotropy of 4H-SiC.
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@@ -34,3 +34,26 @@ The integration time was set to 60 seconds for normal and edge incidence,
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偏振的配置?
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#include "figure-incidence.typ"
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使用以下公式来从实验结果估计拉曼张量:
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$
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abs(S_i) = C I_i (nu_i (1-exp(-(h nu_i)/(k T))))/((nu - nu_i)^4)
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$
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其中 $S_i$ 是对应于入射方向和偏振的拉曼张量的组分,$I_i$ 是散射光强度(对应于峰积分),$nu_i$ 是声子频率,$nu$ 是激光的频率,$T$ 是样品温度。
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$C$ 是一个包含入射光强度在内的常数,在本文中使用 4H-SiC 正入射 zxxz 的特征峰来校准 $C$ 的值。
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在本文中,涉及到对 A1 E1 E2 模式的拉曼张量的估计。
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在本文中,对于 E2 和 A1 在面内的拉曼张量,我们使用正入射 zyyz来估计;
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对于 E1 的拉曼张量,我们使用侧入射 xyzx 来估计;
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对于A1在面外的拉曼张量,我们使用侧入射 xzzx 来估计。
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使用4H-SiC的特征峰来校准 K 值。
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todo
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将拟合结果填充到表格中
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关于正入射和侧入射的对比:拟合得到结果、画曲线图、画箱图
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极性模式对比。有两个方面需要对比。一个是,正、侧入射的不同,说明分裂的大小与我们的计算是否一致,LOPC是否会在其它偏振下出现;一个是,对正入射时E1的出现作解释。
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探索:为什么对于A1的拟合,结果会差两倍?
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8
paper/result/perfect/figure-raman.typ
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8
paper/result/perfect/figure-raman.typ
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@@ -0,0 +1,8 @@
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#figure(
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image("/画图/拉曼整体图/embed.svg"),
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caption: [
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Phonon modes and corresponding Raman spectra of 4H-SiC.
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(a)-(b) Raman spectra with (a) normal and (b) edge incidence configurations.
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],
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placement: none
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)<figure-raman>
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12
paper/result/perfect/non-polar/figure-e1.typ
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12
paper/result/perfect/non-polar/figure-e1.typ
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@@ -0,0 +1,12 @@
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#figure(
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image("/画图/E1减小/embed.svg"),
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caption: [
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(a) Phonon dispersion of 4H-SiC along the A–#sym.Gamma–K high-symmetry path.
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Gray lines represent negligible-polar phonon modes,
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while colored lines indicate strong-polar phonon modes.
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(b) Magnified view of the boxed region in (a).
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The orange dashed lines mark the phonon wavevectors involved in Raman scattering
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with incident light along the z- and y-directions.
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],
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placement: none
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)<fig-e1>
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12
paper/result/perfect/non-polar/figure-nopo-diff.typ
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12
paper/result/perfect/non-polar/figure-nopo-diff.typ
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@@ -0,0 +1,12 @@
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#figure(
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image("/画图/弱极性不同方向偏移/main.svg"),
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caption: [
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(a) Phonon dispersion of 4H-SiC along the A–#sym.Gamma–K high-symmetry path.
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Gray lines represent negligible-polar phonon modes,
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while colored lines indicate strong-polar phonon modes.
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(b) Magnified view of the boxed region in (a).
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The orange dashed lines mark the phonon wavevectors involved in Raman scattering
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with incident light along the z- and y-directions.
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],
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placement: none
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)<fig-nopo-diff>
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@@ -1,11 +1,4 @@
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// 这个表格里的数据来自:
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// 对于 E2,使用正入射 zyyz zyxz 的结果的平均。
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// 对于 E1,使用肩入射 yzxy 的结果。
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// 对于 A1,使用肩入射 yzzy 正入射 zyyz 的结果的平均。
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// 结果来自 2509xx
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// #page(flipped: false)[#rotate(-90deg, reflow: true)[#figure({
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// 拟合结果位于 画图/拉曼结果拟合/250923
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#page(flipped: true)[#figure({
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set text(size: 9pt);
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set par(justify: false);
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@@ -20,12 +13,11 @@
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[Simulation (cm#super[-1])],
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// E2 E2 E1 A1 E1 E2 E2 A1
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[190.51], [197.84], [257.35], m2[591.90], [746.91], [756.25], [764.33], m2[812.87],
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[Experiment (cm#super[-1], averaged)],
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[Experiment (cm#super[-1])],
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// E2 E2 E1 A1 E1 E2 E2 A1
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[195.5], [203.3], [269.7], m2[609.5], [Invisible], [776], [Invisible], m2[839],
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// E2 E2 E1 A1 E1 E2 E2 A1
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[Error (%)], [2.6], [2.7], [4.6], m2[2.9], [-], [2.5], [-], m2[3.1],
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// TODO: 重新检查数据是否正确(主要是正负号)
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table.cell(rowspan: 4)[*Raman Tensor*],
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[Non-zero components],
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// E2 E2 E1 A1
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@@ -38,15 +30,12 @@
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// E1 E2 E2 A1
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[$-2epsilon_1+2zeta_1$], [$bold(8a_2)+2epsilon_2-2zeta_2-4eta_2$], [$-2epsilon_2+2zeta_2$], [$-2zeta_5$], [$-2zeta_6$],
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[Calculation result (a.u.)],
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// TODO: 改正正负号
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// E2 E2 E1 A1 E1 E2 E2 A1
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[0.17], [1.13], [2.43], [2.83], [1.79], [0.09], [88.54], [0.50], [0.01], [1.78],
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[Experiment result #linebreak() (a.u., averaged)],
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// TODO: 填充
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// E2 E2 E1 A1 E1 E2 E2 A1
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[], [], [], [], [], [Invisible], [], [Invisible], [Invisible], [],
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[Experiment result #linebreak() (a.u.)],
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// E2 E2 E1 A1 E1 E2 E2 A1
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[0.15], [1.11], [], [1.64], [], [Invisible], [88.54], [Invisible], [Invisible], [],
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)},
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caption: [Negaligible-polarized Phonons at $Gamma$ Point.],
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)<table-nopol>]
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// TODO: 从多个方向的实验中取得平均值。
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