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@@ -25,19 +25,16 @@ For example, when the light is incident along the y direction (phonon modes on t
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When the light is incident along a direction between z and y,
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When the light is incident along a direction between z and y,
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three phonon modes will exist, but vibration in the mixed direction.
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three phonon modes will exist, but vibration in the mixed direction.
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// 有许多沿 z 方向入射的 4H-SiC 拉曼实验,它们都观察到了两个峰。
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Many Raman experiments on 4H-SiC with incident light along the z direction have observed two peaks.
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// 但没有人在实验上观察到沿其它方向入射的三个峰。
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However, no experiments have reported three peaks with incident light along other directions.
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// 在我们的实验中,我们发现第三个峰只有在聚焦到样品内部时才会出现。
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In our experiments, we found that the third peak only appears when focusing inside the sample.
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// 根据它在不同偏振下的可见性和距离 E2 主峰的距离,我们认定它就是我们要找的峰。
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Based on its visibility under different polarizations and its distance from the main E2 peak,
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we identify it as the peak we are looking for.
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// 极性声子对入射方向非常敏感。拉曼光谱中位置相近的峰实际上是不同的振动方向。我们预言,当入射光斜时,LO 峰会向高频移动,并且会出现三个峰。
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We also notice that the TO peak shifts slightly depending on the polarization direction.
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// 实验验证了我们的猜想。如图,LO 峰如何如何。
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This can be explained by birefringence.
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// 此外,这个 TO 峰可以通过聚焦到内部来得到。
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// 我们还注意到,TO 峰会因为偏振方向的不同而发生一些偏移。这可以由双折射解释。
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// 我们预测,随着入射方向偏移,LO 峰会向着高频方向移动。此外,我们也注意到 LO 也会与载流子产生影响。
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// 在 n 型半导体中,LOPC 模式将代替 LO 模式;在 p 型半导体中,LO 模式仍然单独存在,但它的半高宽会受到载流子浓度的影响。
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// 极性声子模式还会与载流子发生较强的相互作用。
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#include "table-pol.typ"
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#include "table-pol.typ"
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