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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.03107 |
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| _version_ | 1866913342572986368 |
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| author | Gao, Han Kong, Zhen-Zhen Zhang, Po Luo, Yi Su, Haitian Liu, Xiao-Fei Wang, Gui-Lei Wang, Ji-Yin Xu, H. Q. |
| author_facet | Gao, Han Kong, Zhen-Zhen Zhang, Po Luo, Yi Su, Haitian Liu, Xiao-Fei Wang, Gui-Lei Wang, Ji-Yin Xu, H. Q. |
| contents | We report an experimental study of quantum point contacts defined in a high-quality strained germanium quantum well with layered electric gates. At zero magnetic field, we observe quantized conductance plateaus in units of 2$e^2/h$. Bias-spectroscopy measurements reveal that the energy spacing between successive one-dimensional subbands ranges from 1.5 to 5\,meV as a consequence of the small effective mass of the holes and the narrow gate constrictions. At finite magnetic fields perpendicular to the device plane, the edges of the conductance plateaus get splitted due to the Zeeman effect and Landé $g$ factors are estimated to be $\sim6.6$ for the holes in the germanium quantum well. We demonstrate that all quantum point contacts in the same device have comparable performances, indicating a reliable and reproducible device fabrication process. Thus, our work lays a foundation for investigating multiple forefronts of physics in germanium-based quantum devices that require quantum point contacts as a building block. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_03107 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gate-defined quantum point contacts in a germanium quantum well Gao, Han Kong, Zhen-Zhen Zhang, Po Luo, Yi Su, Haitian Liu, Xiao-Fei Wang, Gui-Lei Wang, Ji-Yin Xu, H. Q. Mesoscale and Nanoscale Physics Quantum Physics We report an experimental study of quantum point contacts defined in a high-quality strained germanium quantum well with layered electric gates. At zero magnetic field, we observe quantized conductance plateaus in units of 2$e^2/h$. Bias-spectroscopy measurements reveal that the energy spacing between successive one-dimensional subbands ranges from 1.5 to 5\,meV as a consequence of the small effective mass of the holes and the narrow gate constrictions. At finite magnetic fields perpendicular to the device plane, the edges of the conductance plateaus get splitted due to the Zeeman effect and Landé $g$ factors are estimated to be $\sim6.6$ for the holes in the germanium quantum well. We demonstrate that all quantum point contacts in the same device have comparable performances, indicating a reliable and reproducible device fabrication process. Thus, our work lays a foundation for investigating multiple forefronts of physics in germanium-based quantum devices that require quantum point contacts as a building block. |
| title | Gate-defined quantum point contacts in a germanium quantum well |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2405.03107 |