Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2302.06823 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929213364240384 |
|---|---|
| author | Atanov, Omargeldi Tai, Wai Ting Xie, Ying-Ming Ng, Yat Hei Hammond, Molly A. Ho, Tin Seng Manfred Koo, Tsin Hei Li, Hui Ho, Sui Lun Lyu, Jian Chong, Sukong Zhang, Peng Tai, Lixuan Wang, Jiannong Law, Kam Tuen Wang, Kang L. Lortz, Rolf |
| author_facet | Atanov, Omargeldi Tai, Wai Ting Xie, Ying-Ming Ng, Yat Hei Hammond, Molly A. Ho, Tin Seng Manfred Koo, Tsin Hei Li, Hui Ho, Sui Lun Lyu, Jian Chong, Sukong Zhang, Peng Tai, Lixuan Wang, Jiannong Law, Kam Tuen Wang, Kang L. Lortz, Rolf |
| contents | In this work, ~100 nm wide quantum anomalous Hall insulator (QAHI) nanoribbons are etched from a two-dimensional QAHI film. One part of the nanoribbon is covered with superconducting Nb, while the other part is connected to an Au lead via two-dimensional QAHI regions. Andreev reflection spectroscopy measurements were performed, and multiple in-gap conductance peaks were observed in three different devices. In the presence of an increasing magnetic field perpendicular to the QAHI film, the multiple in-gap peak structure evolves into a single zero-bias conductance peak (ZBCP). Theoretical simulations suggest that the measurements are consistent with the scenario that the increasing magnetic field drives the nanoribbons from a multi-channel occupied regime to a single channel occupied regime, and that the ZBCP may be induced by zero energy Majorana modes as previously predicted [24]. Although further experiments are needed to clarify the nature of the ZBCP, we provide initial evidence that quasi-1D QAHI nanoribbon/superconductor heterostructures are new and promising platforms for realizing zero-energy Majorana modes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_06823 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Proximity-induced quasi-one-dimensional superconducting quantum anomalous Hall state: a promising scalable top-down approach towards localized Majorana modes Atanov, Omargeldi Tai, Wai Ting Xie, Ying-Ming Ng, Yat Hei Hammond, Molly A. Ho, Tin Seng Manfred Koo, Tsin Hei Li, Hui Ho, Sui Lun Lyu, Jian Chong, Sukong Zhang, Peng Tai, Lixuan Wang, Jiannong Law, Kam Tuen Wang, Kang L. Lortz, Rolf Superconductivity In this work, ~100 nm wide quantum anomalous Hall insulator (QAHI) nanoribbons are etched from a two-dimensional QAHI film. One part of the nanoribbon is covered with superconducting Nb, while the other part is connected to an Au lead via two-dimensional QAHI regions. Andreev reflection spectroscopy measurements were performed, and multiple in-gap conductance peaks were observed in three different devices. In the presence of an increasing magnetic field perpendicular to the QAHI film, the multiple in-gap peak structure evolves into a single zero-bias conductance peak (ZBCP). Theoretical simulations suggest that the measurements are consistent with the scenario that the increasing magnetic field drives the nanoribbons from a multi-channel occupied regime to a single channel occupied regime, and that the ZBCP may be induced by zero energy Majorana modes as previously predicted [24]. Although further experiments are needed to clarify the nature of the ZBCP, we provide initial evidence that quasi-1D QAHI nanoribbon/superconductor heterostructures are new and promising platforms for realizing zero-energy Majorana modes. |
| title | Proximity-induced quasi-one-dimensional superconducting quantum anomalous Hall state: a promising scalable top-down approach towards localized Majorana modes |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2302.06823 |