Even-odd effect and Majorana states in full-shell nanowires
Full-shell nanowires (semiconducting nanowires fully coated with a superconducting shell) have been recently presented as an alternative means to create Majorana zero modes. In contrast to partially coated nanowires, it has been argued that full-shell nanowires do not require high magnetic fields an...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-05-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.023171 |
| _version_ | 1797211397026742272 |
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| author | Fernando Peñaranda Ramón Aguado Pablo San-Jose Elsa Prada |
| author_facet | Fernando Peñaranda Ramón Aguado Pablo San-Jose Elsa Prada |
| author_sort | Fernando Peñaranda |
| collection | DOAJ |
| description | Full-shell nanowires (semiconducting nanowires fully coated with a superconducting shell) have been recently presented as an alternative means to create Majorana zero modes. In contrast to partially coated nanowires, it has been argued that full-shell nanowires do not require high magnetic fields and low densities to reach a putative topological regime. Here we present a theoretical study of these devices taking into account all the basic ingredients, including a charge distribution spread across the section of the nanowire, required to qualitatively explain recent experimental results (Vaitiekėnas et al., arXiv:1809.05513). We derive a criterion, dependent on the even-odd occupation of the radial subbands with zero angular momentum, for the appearance of Majorana zero modes. In the absence of angular subband mixing, these give rise to strong zero-bias anomalies in tunneling transport in roughly half of the system's parameter space under an odd number of flux quanta. Due to their coexistence with gapless subbands, the zero modes do not enjoy generic topological protection. Depending on the details of subband mixing in realistic devices, they can develop a topological minigap, acquire a finite lifetime, or even be destroyed. |
| first_indexed | 2024-04-24T10:25:50Z |
| format | Article |
| id | doaj.art-57d5b029bf0d430f833013d830a96858 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:25:50Z |
| publishDate | 2020-05-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-57d5b029bf0d430f833013d830a968582024-04-12T16:54:13ZengAmerican Physical SocietyPhysical Review Research2643-15642020-05-012202317110.1103/PhysRevResearch.2.023171Even-odd effect and Majorana states in full-shell nanowiresFernando PeñarandaRamón AguadoPablo San-JoseElsa PradaFull-shell nanowires (semiconducting nanowires fully coated with a superconducting shell) have been recently presented as an alternative means to create Majorana zero modes. In contrast to partially coated nanowires, it has been argued that full-shell nanowires do not require high magnetic fields and low densities to reach a putative topological regime. Here we present a theoretical study of these devices taking into account all the basic ingredients, including a charge distribution spread across the section of the nanowire, required to qualitatively explain recent experimental results (Vaitiekėnas et al., arXiv:1809.05513). We derive a criterion, dependent on the even-odd occupation of the radial subbands with zero angular momentum, for the appearance of Majorana zero modes. In the absence of angular subband mixing, these give rise to strong zero-bias anomalies in tunneling transport in roughly half of the system's parameter space under an odd number of flux quanta. Due to their coexistence with gapless subbands, the zero modes do not enjoy generic topological protection. Depending on the details of subband mixing in realistic devices, they can develop a topological minigap, acquire a finite lifetime, or even be destroyed.http://doi.org/10.1103/PhysRevResearch.2.023171 |
| spellingShingle | Fernando Peñaranda Ramón Aguado Pablo San-Jose Elsa Prada Even-odd effect and Majorana states in full-shell nanowires Physical Review Research |
| title | Even-odd effect and Majorana states in full-shell nanowires |
| title_full | Even-odd effect and Majorana states in full-shell nanowires |
| title_fullStr | Even-odd effect and Majorana states in full-shell nanowires |
| title_full_unstemmed | Even-odd effect and Majorana states in full-shell nanowires |
| title_short | Even-odd effect and Majorana states in full-shell nanowires |
| title_sort | even odd effect and majorana states in full shell nanowires |
| url | http://doi.org/10.1103/PhysRevResearch.2.023171 |
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