Observation of in-gap states in a two-dimensional CrI2/NbSe2 heterostructure
arxiv(2024)
摘要
Low-dimensional magnetic structures coupled with a superconductor are
promising platforms for realizing Majorana zero modes, which are considered as
novel non-Abelian anyons with potential applications in topological quantum
computing. Here, we report the observation of in-gap edge states and zero-bias
conductance peaks (ZBCPs) in a two-dimensional (2D) magnetic-superconducting
heterostructure consisting of a single-layer chromium diiodide (CrI2) on a
niobium diselenide (NbSe2) superconductor. Single-layer CrI2 nanosheets, which
hold antiferromagnetic (AFM) ground states according to our first-principles
calculations, were epitaxially grown on the layered NbSe2 substrate. By using
scanning tunneling microscopy/spectroscopy, we observed robust in-gap states
spatially located at the edge of the nanosheets and defect-induced ZBCPs inside
the CrI2 nanosheets. Magnetic-flux vortices induced by an external field
exhibit broken threefold rotational symmetry of the pristine NbSe2
superconductor, implying the efficient modulation of the interfacial
superconducting states by the epitaxial CrI2 layer. A phenomenological model
was proposed and suggested the existence of chiral edge states in a 2D
AFM-superconducting hybrid system with an even Chern number, providing a
qualitatively plausible understanding for our experimental observation.
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