准一维α-Bi4Br4纳米带/NbSe2异质结构的分子束外延

IF 9.7 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shiqi Xu , Yongkai Li , Xu Zhang , Chunpan Zhang , Yina Dong , Jiangyue Bai , Haizhen Gao , Nan Cheng , Chishumeng Zhao , Liyuan Zhao , Junfeng Han
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引用次数: 0

摘要

拓扑绝缘体/超导体异质结构为实现马约拉纳费米子和拓扑量子计算提供了重要的平台。然而,一维拓扑超导边态的研究明显缺乏。在这项研究中,我们采用分子束外延技术在超导NbSe2衬底上实现了准1d α-Bi4Br4纳米带的可控范德华外延生长。通过对两种生长技术——共蒸发法和两步法的比较,揭示了纳米带的生长机理,获得了高结晶度、分布均匀的高质量纳米带。x射线衍射和光电子能谱证实了纳米带的(00l)取向生长,拉曼光谱证实了异质结构的形成。值得注意的是,通过精确调整生长参数,我们实现了不同厚度纳米带的可控制备,为研究该系统的尺寸相关拓扑性质奠定了坚实的材料基础。此外,原子力显微镜-红外光谱测量显示,在块带隙(~ 250 meV)以下的边缘局部光学吸收,为边缘态的存在提供了实验证据。这项工作为研究一维拓扑超导态和马约拉纳态建立了理想的平台,推进了拓扑量子器件和计算的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Molecular beam epitaxy of quasi-1D α-Bi4Br4 nanoribbon/NbSe2 heterostructures
Topological insulator/superconductor heterostructures provide an important platform for realizing Majorana fermions and topological quantum computation. However, there is a notable lack of studies on one-dimensional (1D) topological superconducting edge states. In this study, we employed molecular beam epitaxy to achieve controlled van der Waals epitaxial growth of quasi-1D α-Bi4Br4 nanoribbons on superconducting NbSe2 substrates. Through comparison of two growth techniques—co-evaporation and two-step growth methods, we revealed the nanoribbon growth mechanisms and achieved high-quality nanoribbons with high crystallinity and uniform distribution. X-ray diffraction and photoelectron spectroscopy confirmed the (00l)-oriented growth of nanoribbons, while Raman spectroscopy verified the heterostructure formation. Notably, by precisely tuning growth parameters, we achieved controlled preparation of nanoribbons with varying thicknesses, laying a solid material foundation for investigating dimension-dependent topological properties in this system. Moreover, atomic force microscopy-infrared spectroscopy measurements revealed edge-localized optical absorption below the bulk bandgap (∼250 meV), providing experimental evidence for the existence of edge states. This work establishes an ideal platform for investigating 1D topological superconducting states and Majorana states, advancing prospects for topological quantum devices and computation.
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来源期刊
Materials Today Physics
Materials Today Physics Materials Science-General Materials Science
CiteScore
14.00
自引率
7.80%
发文量
284
审稿时长
15 days
期刊介绍: Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.
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