Direct coupling-induced pseudoparity nonconservation scattering: bipolar spin diode and unipolar spin entanglement pairing
The zigzag graphene nanoribbon (ZR) is characterized by the distinct pseudoparity combined with valley-selection rule, which could feature exotic transport phenomena, especially in ZR-based superconducting spintronic devices. However, the ZR with superconductivity induced by proximity of a bulk supe...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ac8f67 |
| _version_ | 1797748446985191424 |
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| author | Mengyao Li Ning Bu Jingguo Hu Yongchun Tao Hao Fu Jun Wang |
| author_facet | Mengyao Li Ning Bu Jingguo Hu Yongchun Tao Hao Fu Jun Wang |
| author_sort | Mengyao Li |
| collection | DOAJ |
| description | The zigzag graphene nanoribbon (ZR) is characterized by the distinct pseudoparity combined with valley-selection rule, which could feature exotic transport phenomena, especially in ZR-based superconducting spintronic devices. However, the ZR with superconductivity induced by proximity of a bulk superconductor (SC) on it still keeps original band properties. Herein, we present a superconducting heterostructure with an SC directly coupling to two ZRs, which is characteristic of pseudoparity-mixing, resulting in pseudoparity nonconservation elastic cotunneling (EC) and crossed Andreev reflection (CAR) processes. It is shown that the mixing leads to the switch effect of the EC and CAR processes manipulated by the SC length, particularly the full spin polarization. In the context of only one magnetized ZR lead, a novel bipolar spin diode behavior on a scale of small SC length and unipolar spin entanglement pairing at some large SC lengths, are both exhibited on a large scale of forward and/or reverse bias voltages. More importantly, the spin-diode can be combined with the quantum spin Hall (QSH) insulator to provide smoking gun evidence for the helical spin texture of the (QSH) insulator, which is still lacking. |
| first_indexed | 2024-03-12T16:04:53Z |
| format | Article |
| id | doaj.art-b80827eb1dd841d4a12301edc61c0978 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:04:53Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
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| series | New Journal of Physics |
| spelling | doaj.art-b80827eb1dd841d4a12301edc61c09782023-08-09T14:25:02ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124909302410.1088/1367-2630/ac8f67Direct coupling-induced pseudoparity nonconservation scattering: bipolar spin diode and unipolar spin entanglement pairingMengyao Li0https://orcid.org/0000-0001-6351-3098Ning Bu1Jingguo Hu2https://orcid.org/0000-0003-3829-5177Yongchun Tao3https://orcid.org/0000-0001-5539-3815Hao Fu4https://orcid.org/0000-0002-9897-2478Jun Wang5https://orcid.org/0000-0002-6278-0677Department of Physics, Nanjing Normal University , Nanjing 210023, People’s Republic of ChinaDepartment of Physics, Nanjing Normal University , Nanjing 210023, People’s Republic of ChinaDepartment of Physics, Yangzhou University , Yangzhou 225009, People’s Republic of ChinaDepartment of Physics, Nanjing Normal University , Nanjing 210023, People’s Republic of ChinaDepartment of Physics, Nanjing Normal University , Nanjing 210023, People’s Republic of China; School of Mathematical Sciences, Nanjing Normal University , Nanjing 210023, People’s Republic of ChinaDepartment of Physics, Southeast University , Nanjing 210096, People’s Republic of ChinaThe zigzag graphene nanoribbon (ZR) is characterized by the distinct pseudoparity combined with valley-selection rule, which could feature exotic transport phenomena, especially in ZR-based superconducting spintronic devices. However, the ZR with superconductivity induced by proximity of a bulk superconductor (SC) on it still keeps original band properties. Herein, we present a superconducting heterostructure with an SC directly coupling to two ZRs, which is characteristic of pseudoparity-mixing, resulting in pseudoparity nonconservation elastic cotunneling (EC) and crossed Andreev reflection (CAR) processes. It is shown that the mixing leads to the switch effect of the EC and CAR processes manipulated by the SC length, particularly the full spin polarization. In the context of only one magnetized ZR lead, a novel bipolar spin diode behavior on a scale of small SC length and unipolar spin entanglement pairing at some large SC lengths, are both exhibited on a large scale of forward and/or reverse bias voltages. More importantly, the spin-diode can be combined with the quantum spin Hall (QSH) insulator to provide smoking gun evidence for the helical spin texture of the (QSH) insulator, which is still lacking.https://doi.org/10.1088/1367-2630/ac8f67spin entanglement pairingzigzag graphene nanoribbonvalley-selection rulespin diodeAndreev reflection |
| spellingShingle | Mengyao Li Ning Bu Jingguo Hu Yongchun Tao Hao Fu Jun Wang Direct coupling-induced pseudoparity nonconservation scattering: bipolar spin diode and unipolar spin entanglement pairing New Journal of Physics spin entanglement pairing zigzag graphene nanoribbon valley-selection rule spin diode Andreev reflection |
| title | Direct coupling-induced pseudoparity nonconservation scattering: bipolar spin diode and unipolar spin entanglement pairing |
| title_full | Direct coupling-induced pseudoparity nonconservation scattering: bipolar spin diode and unipolar spin entanglement pairing |
| title_fullStr | Direct coupling-induced pseudoparity nonconservation scattering: bipolar spin diode and unipolar spin entanglement pairing |
| title_full_unstemmed | Direct coupling-induced pseudoparity nonconservation scattering: bipolar spin diode and unipolar spin entanglement pairing |
| title_short | Direct coupling-induced pseudoparity nonconservation scattering: bipolar spin diode and unipolar spin entanglement pairing |
| title_sort | direct coupling induced pseudoparity nonconservation scattering bipolar spin diode and unipolar spin entanglement pairing |
| topic | spin entanglement pairing zigzag graphene nanoribbon valley-selection rule spin diode Andreev reflection |
| url | https://doi.org/10.1088/1367-2630/ac8f67 |
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