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Quasiparticle interference and impurity resonances on WTe 2
Nano Research ( IF 9.9 ) Pub Date : 2020-06-22 , DOI: 10.1007/s12274-020-2892-8
Hyeokshin Kwon , Taehwan Jeong , Samudrala Appalakondaiah , Youngtek Oh , Insu Jeon , Hongki Min , Seongjun Park , Young Jae Song , Euyheon Hwang , Sungwoo Hwang

Using scanning tunneling microscopy/spectroscopy (STM/STS), we examine quasiparticle scattering and interference properties at the surface of WTe2. WTe2, layered transition metal dichalcogenide, is predicted to be a type-II Weyl semimetal. The Weyl fermion states in WTe2 emerge as topologically protected touching points of electron and hole pockets, and Fermi arcs connecting them can be visible in the spectral function on the surface. To probe the properties of surface states, we have conducted low-temperature STM/STS (at 2.7 K) on the surfaces of WTe2 single crystals. We visualize the surface states of WTe2 with atomic scale resolution. Clear surface states emerging from the bulk electron pocket have been identified and their connection with the bulk electronic states shows good agreement with calculations. We show the interesting double resonance peaks in the local density of states appearing at localized impurities. The low-energy resonant peak occurs near the Weyl point above the Fermi energy and it may be mixed with the surface state of Weyl points, which makes it difficult to observe the topological nature of the Weyl semimetal WTe2.



中文翻译:

WTe 2上的准粒子干扰和杂质共振

使用扫描隧道显微镜/光谱学(STM / STS),我们检查了WTe 2表面的准粒子散射和干涉特性。层状过渡金属卤化钨WTe 2预计为II型Weyl半金属。WTe 2中的Weyl费米子态作为电子和空穴的拓扑保护接触点出现,并且在表面的光谱函数中可以看到连接它们的费米弧。为了探测表面态的性质,我们在WTe 2单晶的表面上进行了低温STM / STS(在2.7 K下)。我们可视化WTe 2的表面状态具有原子尺度的分辨率。已经识别出从体电子袋中出来的透明表面态,并且它们与体电子态的联系与计算显示出良好的一致性。我们显示了在局部杂质处出现的态的局部密度中有趣的双共振峰。低能共振峰出现在费米能以上的Weyl点附近,并且可能与Weyl点的表面状态混合,这使得难以观察Weyl半金属WTe 2的拓扑性质。

更新日期:2020-06-23
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