Antiferromagnetism-driven two-dimensional topological nodal-point superconductivity

Bazarnik, Maciej; Conte, Roberto Lo; Mascot, Eric; von Bergmann, Kirsten; Morr, Dirk K.; Wiesendanger, Roland

doi:10.1038/s41467-023-36201-z

Antiferromagnetism-driven two-dimensional topological nodal-point superconductivity

Journal Article · Fri Feb 03 23:00:00 EST 2023 · Nature Communications

DOI:https://doi.org/10.1038/s41467-023-36201-z· OSTI ID:2419143

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Univ. of Hamburg (Germany); Poznan University of Technology (Poland); Univ. of Hamburg (Germany)
Univ. of Hamburg (Germany)
Univ. of Hamburg (Germany); Univ. of Melbourne, Parkville, VIC (Australia)
Univ. of Illinois, Chicago, IL (United States)

Magnet/superconductor hybrids (MSHs) hold the promise to host emergent topological superconducting phases. Both one-dimensional (1D) and two-dimensional (2D) magnetic systems in proximity to -wave superconductors have shown evidence of gapped topological superconductivity with zero-energy end states and chiral edge modes. Recently, it was proposed that the bulk transition-metal dichalcogenide 4Hb-TaS₂ is a gapless topological nodal-point superconductor (TNPSC). However, there has been no experimental realization of a TNPSC in a MSH system yet. Here we present the discovery of TNPSC in antiferromagnetic (AFM) monolayers on top of an s-wave superconductor. Our calculations show that the topological phase is driven by the AFM order, resulting in the emergence of a gapless time-reversal invariant topological superconducting state. Using low-temperature scanning tunneling microscopy we observe a low-energy edge mode, which separates the topological phase from the trivial one, at the boundaries of antiferromagnetic islands. As predicted by the calculations, we find that the relative spectral weight of the edge mode depends on the edge’s atomic configuration. Our results establish the combination of antiferromagnetism and superconductivity as a novel route to design 2D topological quantum phases.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG)

Grant/Contract Number:: FG02-05ER46225

OSTI ID:: 2419143

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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