Quantized conductance in a CVD-grown nanoribbon with hidden Rashba effect
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arXiv
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| Format: | Preprint |
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2025
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| author | Xiao, Jianfei Ma, Yiwen Tan, Congwei Zhao, Kui Shi, Yunteng Tong, Bingbing Li, Peiling Dou, Ziwei Song, Xiaohui Liu, Guangtong Shen, Jie Lyu, Zhaozheng Lu, Li Peng, Hailin Qu, Fanming |
| author_facet | Xiao, Jianfei Ma, Yiwen Tan, Congwei Zhao, Kui Shi, Yunteng Tong, Bingbing Li, Peiling Dou, Ziwei Song, Xiaohui Liu, Guangtong Shen, Jie Lyu, Zhaozheng Lu, Li Peng, Hailin Qu, Fanming |
| contents | Quantized conductance in quasi-one-dimensional systems not only provides a hallmark of ballistic transport, but also serves as a gateway for exploring quantum phenomena. Recently, a unique hidden Rashba effect attracts tremendous attention, which arises from the compensation of opposite spin polarizations of a Rashba bilayer in inversion symmetric crystals with dipole fields, such as bismuth oxyselenide ($\mathrm{Bi}_{2}\mathrm{O}_{2}\mathrm{Se}$). However, investigating this effect utilizing conductance quantization is still challenging. Here we report the conductance quantization observed in a chemical vapor deposition (CVD)-grown high-mobility $\mathrm{Bi}_{2}\mathrm{O}_{2}\mathrm{Se}$ nanoribbon, where quantized conductance plateaus up to $44\cdot 2e^{2}/{h}$ ($e$ is the elementary charge, $h$ is the Planck constant, and the factor $2$ results from spin degeneracy) are achieved at zero magnetic field. Due to the hidden Rashba effect, the quantized conductance remains in multiples of $2e^{2}/{h}$ without Zeeman splitting even under magnetic field up to $12$ T. Moreover, within a specific range of magnetic field, the plateau sequence exhibits the Pascal triangle series, namely $(1,3,6,10,15\dots )\cdot 2e^{2}/{h}$, reflecting the interplay of size quantization in two transverse directions. These observations are well captured by an effective hidden Rashba bilayer model. Our results demonstrate $\mathrm{Bi}_{2}\mathrm{O}_{2}\mathrm{Se}$ as a compelling platform for spintronics and the investigation of emergent phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_04729 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantized conductance in a CVD-grown nanoribbon with hidden Rashba effect Xiao, Jianfei Ma, Yiwen Tan, Congwei Zhao, Kui Shi, Yunteng Tong, Bingbing Li, Peiling Dou, Ziwei Song, Xiaohui Liu, Guangtong Shen, Jie Lyu, Zhaozheng Lu, Li Peng, Hailin Qu, Fanming Mesoscale and Nanoscale Physics Quantized conductance in quasi-one-dimensional systems not only provides a hallmark of ballistic transport, but also serves as a gateway for exploring quantum phenomena. Recently, a unique hidden Rashba effect attracts tremendous attention, which arises from the compensation of opposite spin polarizations of a Rashba bilayer in inversion symmetric crystals with dipole fields, such as bismuth oxyselenide ($\mathrm{Bi}_{2}\mathrm{O}_{2}\mathrm{Se}$). However, investigating this effect utilizing conductance quantization is still challenging. Here we report the conductance quantization observed in a chemical vapor deposition (CVD)-grown high-mobility $\mathrm{Bi}_{2}\mathrm{O}_{2}\mathrm{Se}$ nanoribbon, where quantized conductance plateaus up to $44\cdot 2e^{2}/{h}$ ($e$ is the elementary charge, $h$ is the Planck constant, and the factor $2$ results from spin degeneracy) are achieved at zero magnetic field. Due to the hidden Rashba effect, the quantized conductance remains in multiples of $2e^{2}/{h}$ without Zeeman splitting even under magnetic field up to $12$ T. Moreover, within a specific range of magnetic field, the plateau sequence exhibits the Pascal triangle series, namely $(1,3,6,10,15\dots )\cdot 2e^{2}/{h}$, reflecting the interplay of size quantization in two transverse directions. These observations are well captured by an effective hidden Rashba bilayer model. Our results demonstrate $\mathrm{Bi}_{2}\mathrm{O}_{2}\mathrm{Se}$ as a compelling platform for spintronics and the investigation of emergent phenomena. |
| title | Quantized conductance in a CVD-grown nanoribbon with hidden Rashba effect |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.04729 |