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arXiv 1811.09445cond-mat.mtrl-sci
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铁掺杂拓扑绝缘体Sb2Te3晶体的量子振荡

Quantum Oscillations in iron-doped topological insulator Sb2Te3 crystals

Weiyao Zhao, David Cortie, Lei Chen, Zhi Li, Zengji Yue, Xiaolin Wang

摘要:

研究了Fe掺杂的拓扑绝缘体Sb 1. 96 Fe 0. 04 Te 3单晶的磁输运性质。与掺杂,能带结构的变化显着和多个费米口袋变得明显的舒布尼科夫-德哈斯振荡,在检测到的单一频率纯Sb 2 Te 3。使用互补密度泛函理论计算,我们确定了一个额外的体空穴袋引入的Γ点,其起源于与Fe掺杂剂相关的化学畸变。实验上,掺杂和未掺杂的样品都是空穴载流子占主导地位的,然而,Fe掺杂也降低了载流子密度和迁移率。分析了角度相关的量子振荡,以表征复杂的费米面和隔离的每个SdH功能的维数。在组件中,至少两个口袋根据它们的旋转依赖性具有2D样行为。这些结果表明杂化掺杂剂带与体和表面拓扑电子结构的复杂的相互作用。

英文摘要:

We investigated the magnetotransport properties of Fe-doped topological insulator Sb1.96 Fe0.04Te3 single crystals. With doping, the band structure changes significantly and multiple Fermi pockets become evident in the Shubnikov-de Haas oscillations, in contrast to the single frequency detected for pure Sb2Te3. Using complementary density functional theory calculations, we identify an additional bulk hole pocket introduced at the Γ point which originates from the chemical distortion associated with the Fe-dopant. Experimentally, both doped and undoped samples are hole-carrier dominated, however, Fe doping also reduces the carrier density and mobility. The angle dependent quantum oscillations were analyzed to characterize the complex Fermi surface and isolate the dimensionality of each SdH feature. Among the components, at least two pockets possess 2D-like behavior according to their rotational dependence. These results indicate a complex interplay of hybridized dopant bands with the bulk and surface topological electronic structure.

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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