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Publication . Article . Preprint . 2022

One-dimensional topological superconductivity based entirely on phase control

Omri Lesser; Yuval Oreg; Ady Stern;
Open Access
Published: 20 Dec 2022 Journal: Physical Review B, volume 106 (issn: 2469-9950, eissn: 2469-9969, Copyright policy )
Publisher: American Physical Society (APS)

Topological superconductivity in one dimension requires time-reversal symmetry breaking, but at the same time it is hindered by external magnetic fields. We offer a general prescription for inducing topological superconductivity in planar superconductor-normal-superconductor-normal-superconductor (SNSNS) Josephson junctions without applying any magnetic fields on the junctions. Our platform relies on two key ingredients: the three parallel superconductors form two SNS junctions with phase winding, and the Fermi velocities for the two spin branches transverse to the junction must be different from one another. The two phase differences between the three superconductors define a parameter plane which includes large topological regions. We analytically derive the critical curves where the topological phase transitions occur, and corroborate the result with a numerical calculation based on a tight-binding model. We further propose material platforms with unequal Fermi velocities, establishing the experimental feasibility of our approach.

Comment: 5+10 pages, 3+8 figures

Subjects by Vocabulary

arXiv: Condensed Matter::Superconductivity


Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Superconductivity (cond-mat.supr-con), FOS: Physical sciences, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity

Related Organizations
Funded by
From Local Elements to Globally Ordered TOPological states of matter
  • Funder: European Commission (EC)
  • Project Code: 788715
  • Funding stream: H2020 | ERC | ERC-ADG