Altermagnetic Routes to Majorana Modes in Zero Net Magnetization
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866918016068878336 |
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| author | Ghorashi, Sayed Ali Akbar Hughes, Taylor L. Cano, Jennifer |
| author_facet | Ghorashi, Sayed Ali Akbar Hughes, Taylor L. Cano, Jennifer |
| contents | We propose heterostructures that realize first and second order topological superconductivity with vanishing net magnetization by utilizing altermagnetism. Such platforms may offer a significant improvement over conventional platforms with uniform magnetization since the latter suppresses the superconducting gap. We first introduce a 1D semiconductor-superconductor structure in proximity to an altermagnet which realizes end Majorana zero modes (MZMs) with vanishing net magnetization. Additionally, a coexisting Zeeman term provides a tuning knob to distinguish topological and trivial zero modes. We then propose 2D altermagnetic platforms that can realize chiral Majorana fermions or higher order corner MZMs. Our work paves the way towards realizing Majorana boundary states with an alternative source of time-reversal breaking and zero net magnetization. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2306_09413 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Altermagnetic Routes to Majorana Modes in Zero Net Magnetization Ghorashi, Sayed Ali Akbar Hughes, Taylor L. Cano, Jennifer Mesoscale and Nanoscale Physics Materials Science Superconductivity We propose heterostructures that realize first and second order topological superconductivity with vanishing net magnetization by utilizing altermagnetism. Such platforms may offer a significant improvement over conventional platforms with uniform magnetization since the latter suppresses the superconducting gap. We first introduce a 1D semiconductor-superconductor structure in proximity to an altermagnet which realizes end Majorana zero modes (MZMs) with vanishing net magnetization. Additionally, a coexisting Zeeman term provides a tuning knob to distinguish topological and trivial zero modes. We then propose 2D altermagnetic platforms that can realize chiral Majorana fermions or higher order corner MZMs. Our work paves the way towards realizing Majorana boundary states with an alternative source of time-reversal breaking and zero net magnetization. |
| title | Altermagnetic Routes to Majorana Modes in Zero Net Magnetization |
| topic | Mesoscale and Nanoscale Physics Materials Science Superconductivity |
| url | https://arxiv.org/abs/2306.09413 |