Topological superconductivity in carbon nanotubes with a small magnetic flux
| Title: | Topological superconductivity in carbon nanotubes with a small magnetic flux |
|---|---|
| Authors: | Lesser, Omri, Shavit, Gal, Oreg, Yuval |
| Source: | Phys. Rev. Research 2, 023254 (2020) |
| Publication Year: | 2020 |
| Collection: | Condensed Matter |
| Subject Terms: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity |
| More Details: | We show that a one-dimensional topological superconductor can be realized in carbon nanotubes, using a relatively small magnetic field. Our analysis relies on the intrinsic curvature-enhanced spin-orbit coupling of the nanotubes, as well as on the orbital effect of a magnetic flux threaded through the nanotube. Tuning experimental parameters, we show that a half-metallic state may be induced in the nanotube. Coupling the system to an Ising superconductor, with an appreciable spin-triplet component, can then drive the nanotube into a topological superconducting phase. The proposed scheme is investigated by means of real-space tight-binding simulations, accompanied by an effective continuum low-energy theory, which allows us to gain some insight on the roles of different terms in the Hamiltonian. We calculate the topological phase diagram and ascertain the existence of localized Majorana zero modes near the edges. Moreover, we find that in the absence of a magnetic field, a regime exists where sufficiently strong interactions drive the system into a time-reversal-invariant topological superconducting phase. Comment: 11 pages, 7 figures |
| Document Type: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.2.023254 |
| Access URL: | http://arxiv.org/abs/2003.01730 |
| Accession Number: | edsarx.2003.01730 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Topological superconductivity in carbon nanotubes with a small magnetic flux – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lesser%2C+Omri%22">Lesser, Omri</searchLink><br /><searchLink fieldCode="AR" term="%22Shavit%2C+Gal%22">Shavit, Gal</searchLink><br /><searchLink fieldCode="AR" term="%22Oreg%2C+Yuval%22">Oreg, Yuval</searchLink> – Name: TitleSource Label: Source Group: Src Data: Phys. Rev. Research 2, 023254 (2020) – Name: DatePubCY Label: Publication Year Group: Date Data: 2020 – Name: Subset Label: Collection Group: HoldingsInfo Data: Condensed Matter – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Condensed+Matter+-+Mesoscale+and+Nanoscale+Physics%22">Condensed Matter - Mesoscale and Nanoscale Physics</searchLink><br /><searchLink fieldCode="DE" term="%22Condensed+Matter+-+Superconductivity%22">Condensed Matter - Superconductivity</searchLink> – Name: Abstract Label: Description Group: Ab Data: We show that a one-dimensional topological superconductor can be realized in carbon nanotubes, using a relatively small magnetic field. Our analysis relies on the intrinsic curvature-enhanced spin-orbit coupling of the nanotubes, as well as on the orbital effect of a magnetic flux threaded through the nanotube. Tuning experimental parameters, we show that a half-metallic state may be induced in the nanotube. Coupling the system to an Ising superconductor, with an appreciable spin-triplet component, can then drive the nanotube into a topological superconducting phase. The proposed scheme is investigated by means of real-space tight-binding simulations, accompanied by an effective continuum low-energy theory, which allows us to gain some insight on the roles of different terms in the Hamiltonian. We calculate the topological phase diagram and ascertain the existence of localized Majorana zero modes near the edges. Moreover, we find that in the absence of a magnetic field, a regime exists where sufficiently strong interactions drive the system into a time-reversal-invariant topological superconducting phase.<br />Comment: 11 pages, 7 figures – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1103/PhysRevResearch.2.023254 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2003.01730" linkWindow="_blank">http://arxiv.org/abs/2003.01730</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2003.01730 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1103/PhysRevResearch.2.023254 Subjects: – SubjectFull: Condensed Matter - Mesoscale and Nanoscale Physics Type: general – SubjectFull: Condensed Matter - Superconductivity Type: general Titles: – TitleFull: Topological superconductivity in carbon nanotubes with a small magnetic flux Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lesser, Omri – PersonEntity: Name: NameFull: Shavit, Gal – PersonEntity: Name: NameFull: Oreg, Yuval IsPartOfRelationships: – BibEntity: Dates: – D: 03 M: 03 Type: published Y: 2020 |
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