Effect of isotope disorder on the Raman spectra of cubic boron arsenide
Effect of isotope disorder on the Raman spectra of cubic boron arsenide
复制标题
同位素无序对立方砷化硼拉曼光谱的影响
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
D. Cahill
中科院分区：
文献类型：
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作者：
Akash Rai;Sheng Li;Hanlin Wu;B. Lv;D. Cahill
砷化硼（c-BAs）处于超高导热材料研究的前沿。我们对同位素定制的立方砷化硼单晶进行了拉曼散射研究，涉及 11 种同位素成分，范围从接近纯的 c-$^{10}$BA 到接近纯的 c-$^{11}$BA。我们的结果提供了关于强质量无序对光学声子的影响以及混合晶体拉曼光谱中双模行为的出现的见解。强同位素无序还放宽了单声子拉曼选择规则，导致声学声子产生无序激活拉曼散射。
Boron arsenide (c-BAs) is at the forefront of research on ultrahigh thermal conductivity materials. We present a Raman scattering study of isotopically tailored cubic boron arsenide single crystals for 11 isotopic compositions spanning the range from nearly pure c-$^{10}$BAs to nearly pure c-$^{11}$BAs. Our results provide insights on the effects of strong mass disorder on optical phonons and the appearance of two-mode behavior in the Raman spectra of mixed crystals. Strong isotope disorder also relaxes the one-phonon Raman selection rules, resulting in disorder-activated Raman scattering by acoustic phonons.