拉曼光谱
材料科学
凝聚态物理
光谱学
单层
自旋电子学
范德瓦尔斯力
自旋(空气动力学)
各向异性
量子点
结晶学
物理
纳米技术
铁磁性
量子力学
化学
分子
热力学
作者
Zhenyu Sun,Zhaopeng Guo,Dayu Yan,Peng Cheng,Lan Chen,Youguo Shi,Yuan Huang,Zhijun Wang,Kehui Wu,Baojie Feng
出处
期刊:Physical Review Materials
[American Physical Society]
日期:2023-09-14
卷期号:7 (9)
被引量:1
标识
DOI:10.1103/physrevmaterials.7.094004
摘要
Two-dimensional topological insulators (2DTIs) or quantum spin Hall insulators are attracting increasing attention due to their potential applications in next-generation spintronic devices. Despite their promising prospects, realizable 2DTIs are still limited. Recently, ${\mathrm{Ta}}_{2}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{5}$, a semiconducting van der Waals material, has shown spectroscopic evidence of quantum spin Hall states. However, achieving controlled preparation of few to monolayer samples, a crucial step in realizing quantum spin Hall devices, has not yet been achieved. In this work, we fabricated few to monolayer ${\mathrm{Ta}}_{2}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{5}$ and performed systematic thickness- and temperature-dependent Raman spectroscopy measurements. Our results demonstrate that Raman spectra can provide valuable information to determine the thickness of ${\mathrm{Ta}}_{2}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{5}$ thin flakes. Moreover, our angle-resolved polarized Raman (ARPR) spectroscopy measurements show that the intensities of the Raman peaks are strongly anisotropic due to the quasi-one-dimensional atomic structure, providing a straightforward method to determine its crystalline orientation. Our findings may stimulate further efforts to realize quantum devices based on few or monolayer ${\mathrm{Ta}}_{2}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{5}$.
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