Spectral functions of CVD grown MoS2 monolayers after chemical transfer onto Au surface
Spectral functions of CVD grown MoS2 monolayers after chemical transfer onto Au surface
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DOI：
10.1016/j.apsusc.2020.147390
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发表时间：
2020-12-01
影响因子：
6.7
通讯作者：
Cha, SeungNam
中科院分区：
文献类型：
--
作者：
Jung, Sung Won;Pak, Sangyeon;Cha, SeungNam
最近兴起的范德华(VDW)晶体为研究多功能和奇异的基础物理以及未来的设备应用如双曲电子学开辟了新的前景。尽管纳米聚焦光学在角度分辨光电子能谱(ARPES)方面的最新进展，但要获得高分辨率的ARPES光谱，使化学转移的晶体表面和界面清洁一直是一个挑战。通过采用亚微米量级的纳米ARPES和聚苯乙烯辅助转移，然后在超高真空环境中进行热处理，可以测量到CVD生长的单层MoS_2的自旋轨道分裂和能带重整化等非常清晰的ARPES光谱特征。我们的发现为利用化学转移晶体测量高分辨率ARPES光谱来观察VDW异质结构中的奇异准粒子铺平了道路。
The recent rise of van der Waals (vdW) crystals has opened new prospects for studying versatile and exotic fundamental physics with future device applications such as twistronics. Even though the recent development on Angle-resolved photoemission spectroscopy (ARPES) with Nano-focusing optics, making clean surfaces and interfaces of chemically transferred crystals have been challenging to obtain high-resolution ARPES spectra. Here, we show that by employing nano-ARPES with submicron sized beam and polystyrene-assisted transfer followed by annealing process in ultra-high vacuum environment, remarkably clear ARPES spectral features such as spinorbit splitting and band renormalization of CVD-grown, monolayered MoS2 can be measured. Our finding paves a way to exploit chemically transferred crystals for measuring high-resolution ARPES spectra to observe exotic quasi-particles in vdW heterostructures.