Majorana corner modes in unconventional monolayers of the 1T-PtSe2 family
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866910540439224320 |
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| author | Sheng, Haohao Xie, Yue Wu, Quansheng Weng, Hongming Dai, Xi Bernevig, B. Andrei Fang, Zhong Wang, Zhijun |
| author_facet | Sheng, Haohao Xie, Yue Wu, Quansheng Weng, Hongming Dai, Xi Bernevig, B. Andrei Fang, Zhong Wang, Zhijun |
| contents | In this work, we propose that Majorana zero modes can be realized at the corners of the two-dimensional unconventional insulator. We demonstrate that 1T-PtSe2 is a symmetry indicator-free (SI-free) unconventional insulator, originating from orbital hybridization between Pt $d$ and Se $p_{x,y}$ states. The kind of SI-free unconventionality has no symmetry eigenvalue indication. Instead, it is diagnosed directly by the Wannier charge centers by using the one-dimensional Wilson loop method. The obstructed edge states exhibit strong anisotropy and large Rashba splitting. By introducing superconducting proximity and an external magnetic field, the Majorana corner modes can be obtained in the 1T-PtSe2 monolayer. In the end, we construct a two-Bernevig-Hughes-Zhang model with anisotropy to capture the Majorana physics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_12055 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Majorana corner modes in unconventional monolayers of the 1T-PtSe2 family Sheng, Haohao Xie, Yue Wu, Quansheng Weng, Hongming Dai, Xi Bernevig, B. Andrei Fang, Zhong Wang, Zhijun Materials Science Superconductivity In this work, we propose that Majorana zero modes can be realized at the corners of the two-dimensional unconventional insulator. We demonstrate that 1T-PtSe2 is a symmetry indicator-free (SI-free) unconventional insulator, originating from orbital hybridization between Pt $d$ and Se $p_{x,y}$ states. The kind of SI-free unconventionality has no symmetry eigenvalue indication. Instead, it is diagnosed directly by the Wannier charge centers by using the one-dimensional Wilson loop method. The obstructed edge states exhibit strong anisotropy and large Rashba splitting. By introducing superconducting proximity and an external magnetic field, the Majorana corner modes can be obtained in the 1T-PtSe2 monolayer. In the end, we construct a two-Bernevig-Hughes-Zhang model with anisotropy to capture the Majorana physics. |
| title | Majorana corner modes in unconventional monolayers of the 1T-PtSe2 family |
| topic | Materials Science Superconductivity |
| url | https://arxiv.org/abs/2308.12055 |