The Noncollinear Path to Two-Dimensional Topological Superconductivity

Brüning, Reiner; Bedow, Jasmin; Lo Conte, Roberto; von Bergmann, Kirsten; Morr, Dirk K.; Wiesendanger, Roland

doi:10.1021/acsnano.5c07565

The Noncollinear Path to Two-Dimensional Topological Superconductivity

Journal Article · Thu Oct 09 00:00:00 EDT 2025 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.5c07565· OSTI ID:3000219

Brüning, Reiner ^[1]; ^[2]; ^[3]; ^[1]; Morr, Dirk K. ^[2]; Wiesendanger, Roland ^[1]

Univ. of Hamburg (Germany)
Univ. of Illinois, Chicago, IL (United States)
Univ. of Hamburg (Germany); Univ. of Groningen (Netherlands)

Two-dimensional magnet-superconductor hybrids (2D-MSH) are promising candidates to realize devices for topology-based quantum technologies and superconducting spintronics. So far, studies have focused on 2D-MSH systems with collinear ferro- or antiferromagnetic layers. Here, we present the discovery of topological superconductivity in a noncollinear MSH system where a magnetic spiral is realized in an Fe monolayer proximity coupled to a superconducting Ta(110) substrate. By combining low-temperature spin-polarized scanning tunneling spectroscopy with an in-depth theoretical study, we can conclude that the system is in a topological nodal-point superconducting phase with low-energy edge modes. Furthermore, we reveal that for this noncollinear spin texture, these edge modes exhibit a magnetization direction-dependent dispersion. This means that a spatial shift of the magnetic spiral could be used to reverse the chirality of an edge mode in future MSH-based devices.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Illinois, Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46225

OSTI ID:: 3000219

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 41 Vol. 19; ISSN 1936-086X; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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chiral edge modes
noncollinear magnet-superconductor hybrids
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spin-polarized scanning tunneling spectroscopy
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The Noncollinear Path to Two-Dimensional Topological Superconductivity

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