arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2303.04697cond-mat.mtrl-scicond-mat.other
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ScAlMgO4的光学、电子和结构性质

Optical, electronic and structural properties of ScAlMgO4

Tomasz Stefaniuka, Jan Suffczyński, Małgorzata Wierzbowsk, Jarosław Z. Domagała, Jarosław Kisielewski, Andrzej Kłos, Alexander Korneluk, Henryk Teisseyre

摘要:

铝酸镁氧化钪(ScAlMgO 4)是一种很有前途的GAN基和ZnO基光电子器件晶格匹配衬底材料。然而,尽管其明显的优势,通常用于异质外延生长的基板,ScAlMgO 4的几个基本属性仍然不确定。在这里,我们提供了一个全面的图片,它的光学,电子和结构特性,通过研究直拉法生长的ScAlMgO 4单晶。我们使用可变角光谱椭圆偏振法来确定复杂的面内和面外折射率在193至1690 nm的范围内。一个基于闪烁器的模型提供了一个现象学描述的椭圆偏振光谱在整个波长范围内具有良好的协议。为方便起见,我们还向读者提供柯西公式,用于描述波长大于400 nm时各向异性折射率的实部。从头算多体微扰理论建模提供了有关ScAlMgO 4的电子结构的信息,并成功地验证了实验获得的折射率值。模拟还显示激子结合能高达几百毫电子伏,表明ScAlMgO4作为一种有前途的材料,用于实现在室温下工作的低阈值,深紫外激光器件。X射线衍射测量证实了先前报道的ScAlMgO4的晶格常数,但另外,揭示了主导晶面(001)相互倾斜约0.009°。鉴于我们的工作,ScAlMgO4是一种高度透明、低折射率、双折射的材料,类似于蓝宝石,但具有更有利的晶格常数和更简单的加工。

英文摘要:

Magnesium aluminate scandium oxide (ScAlMgO4) is a promising lattice-matched substrate material for GaN- and ZnO-based optoelectronic devices. Yet, despite its clear advantages over substrates commonly used in heteroepitaxial growth, several fundamental properties of ScAlMgO4 remain unsettled. Here, we provide a comprehensive picture of its optical, electronic and structural properties by studying ScAlMgO4 single crystals grown by the Czochralski method. We use variable angle spectroscopic ellipsometry to determine complex in-plane and out-of-plane refractive indices in the range from 193 to 1690 nm. An oscillator-based model provides a phenomenological description of the ellipsometric spectra with excellent agreement over the entire range of wavelengths. For convenience, we supply the reader also with Cauchy formulas describing the real part of the anisotropic refractive index for wavelengths above 400 nm. Ab initio many-body perturbation theory modeling provides information about the electronic structure of ScAlMgO4, and successfully validated experimentally obtained refractive index values. Simulations also show exciton binding energy as large as a few hundred of meV, indicating ScAlMgO4 as a promising material for implementation in low-threshold, deep-UV lasing devices operating at room temperature. X-ray diffraction measurements confirm lattice constants of ScAlMgO4 previously reported, but in addition, reveal that dominant crystallographic planes (001) are mutually inclined by about 0.009°. In view of our work, ScAlMgO4 is a highly transparent, low refractive index, birefringent material similar to a sapphire, but with a much more favorable lattice constant and simpler processing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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