Atomic-scale interface engineering of Majorana edge modes in a 2D magnet-superconductor hybrid system

Palacio-Morales, Alexandra; Mascot, Eric; Cocklin, Sagen; Kim, Howon; Rachel, Stephan; Morr, Dirk K.; Wiesendanger, Roland

doi:10.1126/sciadv.aav6600

Atomic-scale interface engineering of Majorana edge modes in a 2D magnet-superconductor hybrid system

Journal Article · Fri Jul 26 00:00:00 EDT 2019 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aav6600· OSTI ID:1618190

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Univ. of Hamburg (Germany); University of Illinois at Chicago
Univ. of Illinois, Chicago, IL (United States)
Univ. of Hamburg (Germany)
Univ. of Melbourne (Australia)

Topological superconductors are predicted to harbor exotic boundary states—Majorana zero-energy modes—whose non-Abelian braiding statistics present a new paradigm for the realization of topological quantum computing. Using low-temperature scanning tunneling spectroscopy, here, we report on the direct real-space visualization of chiral Majorana edge states in a monolayer topological superconductor, a prototypical magnet-superconductor hybrid system composed of nanoscale Fe islands of monoatomic height on a Re(0001)-O(2 × 1) surface. In particular, we demonstrate that interface engineering by an atomically thin oxide layer is crucial for driving the hybrid system into a topologically nontrivial state as confirmed by theoretical calculations of the topological invariant, the Chern number.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Berkeley, CA (United States); Univ. of Illinois, Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; FG02-05ER46225

OSTI ID:: 1618190

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 7 Vol. 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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