Evanescent-mode-assisted Klein tunneling in dual-gated bilayer graphene
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866917507003056128 |
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| author | Huang, Yupeng Zeng, W. |
| author_facet | Huang, Yupeng Zeng, W. |
| contents | We theoretically investigate the electron tunneling in dual-gated bilayer graphene-based $n/p$ junctions. It is shown that a band gap is introduced by tuning the gate voltage, which modifies the pseudospin polarization and breaks anti-Klein tunneling at normal incidence. Specifically, when the pseudospin polarization vectors for the propagating and evanescent wave modes on the left and right regions of the junction are orthogonal, a revival of Klein tunneling is achieved. The Berry phase associated with Klein tunneling in dual-gated bilayer graphene is not limited to $π$ but varies with the junction parameters. Furthermore, the Klein tunneling is accompanied by a $π$ jump in the reflection phase around the normal incidence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_23096 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evanescent-mode-assisted Klein tunneling in dual-gated bilayer graphene Huang, Yupeng Zeng, W. Mesoscale and Nanoscale Physics We theoretically investigate the electron tunneling in dual-gated bilayer graphene-based $n/p$ junctions. It is shown that a band gap is introduced by tuning the gate voltage, which modifies the pseudospin polarization and breaks anti-Klein tunneling at normal incidence. Specifically, when the pseudospin polarization vectors for the propagating and evanescent wave modes on the left and right regions of the junction are orthogonal, a revival of Klein tunneling is achieved. The Berry phase associated with Klein tunneling in dual-gated bilayer graphene is not limited to $π$ but varies with the junction parameters. Furthermore, the Klein tunneling is accompanied by a $π$ jump in the reflection phase around the normal incidence. |
| title | Evanescent-mode-assisted Klein tunneling in dual-gated bilayer graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.23096 |