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
Abstract
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.
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.