Orientation-dependent crossover from retro to specular Andreev reflections in semi-Dirac materials
In the framework of Bogoliubov–de Gennes equation, we theoretically study the transport properties in normal-superconducting junctions based on semi-Dirac materials (SDMs). Owing to the intrinsic anisotropy of SDMs, the configuration of Andreev reflection (AR) and the differential conductance are st...
| 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/ac6e7f |
| _version_ | 1797748476327493632 |
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| author | Hai Li Xiang Hu Gang Ouyang |
| author_facet | Hai Li Xiang Hu Gang Ouyang |
| author_sort | Hai Li |
| collection | DOAJ |
| description | In the framework of Bogoliubov–de Gennes equation, we theoretically study the transport properties in normal-superconducting junctions based on semi-Dirac materials (SDMs). Owing to the intrinsic anisotropy of SDMs, the configuration of Andreev reflection (AR) and the differential conductance are strongly orientation-dependent. For the transport along the linear dispersion direction, the differential conductance exhibits a clear crossover from retro AR to specular AR with increasing the bias-voltage, and the differential conductance oscillates with the interfacial barrier strength without a decaying profile. Conversely, for the transport along the quadratic dispersion direction, the boundary between the retro AR and specular AR becomes ambiguous when the orientation angle increases, and the differential conductance decays with increasing the momentum mismatch or the interfacial barrier strength. We illustrate the pseudo-spin textures to reveal the underling physics behind the anisotropic coherent transport properties. These results enrich the understanding of the superconducting coherent transport in SDMs. |
| first_indexed | 2024-03-12T16:06:19Z |
| format | Article |
| id | doaj.art-2ae00abc975041fc8162e4e2299d144c |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:06:19Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-2ae00abc975041fc8162e4e2299d144c2023-08-09T14:20:53ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124505304910.1088/1367-2630/ac6e7fOrientation-dependent crossover from retro to specular Andreev reflections in semi-Dirac materialsHai Li0https://orcid.org/0000-0003-2420-1926Xiang Hu1Gang Ouyang2https://orcid.org/0000-0003-2589-9641Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University , Changsha 410081, People’s Republic of ChinaKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University , Changsha 410081, People’s Republic of China; Department of Physics, William & Mary , Williamsburg, VA 23187, United States of AmericaKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University , Changsha 410081, People’s Republic of ChinaIn the framework of Bogoliubov–de Gennes equation, we theoretically study the transport properties in normal-superconducting junctions based on semi-Dirac materials (SDMs). Owing to the intrinsic anisotropy of SDMs, the configuration of Andreev reflection (AR) and the differential conductance are strongly orientation-dependent. For the transport along the linear dispersion direction, the differential conductance exhibits a clear crossover from retro AR to specular AR with increasing the bias-voltage, and the differential conductance oscillates with the interfacial barrier strength without a decaying profile. Conversely, for the transport along the quadratic dispersion direction, the boundary between the retro AR and specular AR becomes ambiguous when the orientation angle increases, and the differential conductance decays with increasing the momentum mismatch or the interfacial barrier strength. We illustrate the pseudo-spin textures to reveal the underling physics behind the anisotropic coherent transport properties. These results enrich the understanding of the superconducting coherent transport in SDMs.https://doi.org/10.1088/1367-2630/ac6e7fsemi-DiracAndreev reflectionpseudo-spincrossoveranisotropy |
| spellingShingle | Hai Li Xiang Hu Gang Ouyang Orientation-dependent crossover from retro to specular Andreev reflections in semi-Dirac materials New Journal of Physics semi-Dirac Andreev reflection pseudo-spin crossover anisotropy |
| title | Orientation-dependent crossover from retro to specular Andreev reflections in semi-Dirac materials |
| title_full | Orientation-dependent crossover from retro to specular Andreev reflections in semi-Dirac materials |
| title_fullStr | Orientation-dependent crossover from retro to specular Andreev reflections in semi-Dirac materials |
| title_full_unstemmed | Orientation-dependent crossover from retro to specular Andreev reflections in semi-Dirac materials |
| title_short | Orientation-dependent crossover from retro to specular Andreev reflections in semi-Dirac materials |
| title_sort | orientation dependent crossover from retro to specular andreev reflections in semi dirac materials |
| topic | semi-Dirac Andreev reflection pseudo-spin crossover anisotropy |
| url | https://doi.org/10.1088/1367-2630/ac6e7f |
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