Selective area epitaxy of PbTe-Pb hybrid nanowires on a lattice-matched substrate
| Autor: | Jiang, Yuying, Yang, Shuai, Li, Lin, Song, Wenyu, Miao, Wentao, Tong, Bingbing, Geng, Zuhan, Gao, Yichun, Li, Ruidong, Zhang, Qinghua, Meng, Fanqi, Gu, Lin, Zhu, Kejing, Zang, Yunyi, Shang, Runan, Feng, Xiao, Xue, Qi-Kun, Liu, Dong E., Zhang, Hao, He, Ke |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. Materials 6, 034205 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.6.034205 |
| Popis: | Topological quantum computing is based on braiding of Majorana zero modes encoding topological qubits. A promising candidate platform for Majorana zero modes is semiconductor-superconductor hybrid nanowires. The realization of topological qubits and braiding operations requires scalable and disorder-free nanowire networks. Selective area growth of in-plane InAs and InSb nanowires, together with shadow-wall growth of superconductor structures, have demonstrated this scalability by achieving various network structures. However, the noticeable lattice mismatch at the nanowire-substrate interface, acting as a disorder source, imposes a serious obstacle along with this roadmap. Here, combining selective area and shadow-wall growth, we demonstrate the fabrication of PbTe-Pb hybrid nanowires - another potentially promising Majorana system - on a nearly perfectly lattice-matched substrate CdTe, all done in one molecular beam epitaxy chamber. Transmission electron microscopy shows the single-crystal nature of the PbTe nanowire and its atomically sharp and clean interfaces to the CdTe substrate and the Pb overlayer, without noticeable inter-diffusion or strain. The nearly ideal interface condition, together with the strong screening of charge impurities due to the large dielectric constant of PbTe, hold promise towards a clean nanowire system to study Majorana zero modes and topological quantum computing. Comment: 19 pages, 4+7 figures |
| Databáze: | arXiv |
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