Proximity-induced anomalous topological superconductivity in an antiferromagnetic honeycomb-lattice
Topological superconductivity, generated in an engineered system with the proximity effect from an s-wave superconductor, usually requires the original sample to be a topological insulator. In this study, we propose a novel form of topological superconductivity in a honeycomb lattice arising from bo...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/adb779 |
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| author | Fenghua Qi Yuanyuan Xiang Jie Cao Guojun Jin |
| author_facet | Fenghua Qi Yuanyuan Xiang Jie Cao Guojun Jin |
| author_sort | Fenghua Qi |
| collection | DOAJ |
| description | Topological superconductivity, generated in an engineered system with the proximity effect from an s-wave superconductor, usually requires the original sample to be a topological insulator. In this study, we propose a novel form of topological superconductivity in a honeycomb lattice arising from both antiferromagnetism (AFM) and s-wave superconductivity. Eventhough the honeycomb lattice with AFM is a normal insulator, the inherent topology of such a system is nontrivial. The topology of the system is determined by the relative values of the s-wave pairing potential and antiferromagnetic order. Notably, there are no chiral edge states at the open boundary if the engineered system is uniform everywhere, whether topologically trivial or not. However, when two parts with different topologies are brought together, two chiral edge states emerge at the topological phase boundary in the middle of the material. This challenges the bulk-edge correspondence observed in conventional topological materials. These chiral edge states are protected by valley symmetry and, owing to their Majorana fermion nature, can contribute to a half-integer quantized conductance. |
| format | Article |
| id | doaj-art-e31453f3a4ae4ad29d8907aca22bc47e |
| institution | DOAJ |
| issn | 1367-2630 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj-art-e31453f3a4ae4ad29d8907aca22bc47e2025-08-20T03:05:01ZengIOP PublishingNew Journal of Physics1367-26302025-01-0127202303710.1088/1367-2630/adb779Proximity-induced anomalous topological superconductivity in an antiferromagnetic honeycomb-latticeFenghua Qi0Yuanyuan Xiang1https://orcid.org/0000-0002-9218-1886Jie Cao2Guojun Jin3https://orcid.org/0000-0001-8184-9249School of Electronic Engineering, Nanjing Xiaozhuang University , Nanjing 211171, People’s Republic of ChinaCollege of Mechanics and Engineering Science, Hohai University , Nanjing 210098, People’s Republic of ChinaCollege of Mechanics and Engineering Science, Hohai University , Nanjing 210098, People’s Republic of ChinaNational Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, People’s Republic of China; School of Physics Science and Technology, Kunming University , Kunming 650214, People’s Republic of ChinaTopological superconductivity, generated in an engineered system with the proximity effect from an s-wave superconductor, usually requires the original sample to be a topological insulator. In this study, we propose a novel form of topological superconductivity in a honeycomb lattice arising from both antiferromagnetism (AFM) and s-wave superconductivity. Eventhough the honeycomb lattice with AFM is a normal insulator, the inherent topology of such a system is nontrivial. The topology of the system is determined by the relative values of the s-wave pairing potential and antiferromagnetic order. Notably, there are no chiral edge states at the open boundary if the engineered system is uniform everywhere, whether topologically trivial or not. However, when two parts with different topologies are brought together, two chiral edge states emerge at the topological phase boundary in the middle of the material. This challenges the bulk-edge correspondence observed in conventional topological materials. These chiral edge states are protected by valley symmetry and, owing to their Majorana fermion nature, can contribute to a half-integer quantized conductance.https://doi.org/10.1088/1367-2630/adb779anomalous topological superconductivityproximityantiferromagnetic honeycomb-lattice |
| spellingShingle | Fenghua Qi Yuanyuan Xiang Jie Cao Guojun Jin Proximity-induced anomalous topological superconductivity in an antiferromagnetic honeycomb-lattice New Journal of Physics anomalous topological superconductivity proximity antiferromagnetic honeycomb-lattice |
| title | Proximity-induced anomalous topological superconductivity in an antiferromagnetic honeycomb-lattice |
| title_full | Proximity-induced anomalous topological superconductivity in an antiferromagnetic honeycomb-lattice |
| title_fullStr | Proximity-induced anomalous topological superconductivity in an antiferromagnetic honeycomb-lattice |
| title_full_unstemmed | Proximity-induced anomalous topological superconductivity in an antiferromagnetic honeycomb-lattice |
| title_short | Proximity-induced anomalous topological superconductivity in an antiferromagnetic honeycomb-lattice |
| title_sort | proximity induced anomalous topological superconductivity in an antiferromagnetic honeycomb lattice |
| topic | anomalous topological superconductivity proximity antiferromagnetic honeycomb-lattice |
| url | https://doi.org/10.1088/1367-2630/adb779 |
| work_keys_str_mv | AT fenghuaqi proximityinducedanomaloustopologicalsuperconductivityinanantiferromagnetichoneycomblattice AT yuanyuanxiang proximityinducedanomaloustopologicalsuperconductivityinanantiferromagnetichoneycomblattice AT jiecao proximityinducedanomaloustopologicalsuperconductivityinanantiferromagnetichoneycomblattice AT guojunjin proximityinducedanomaloustopologicalsuperconductivityinanantiferromagnetichoneycomblattice |