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In this work, ~100 nm wide quantum anomalous Hall insulator (QAHI)nanoribbons are etched from a two-dimensional QAHI film. One part of thenanoribbon is covered with superconducting Nb, while the other part isconnected to an Au lead via two-dimensional QAHI regions. Andreev reflectionspectroscopy measurements were performed, and multiple in-gap conductance peakswere observed in three different devices. In the presence of an increasingmagnetic field perpendicular to the QAHI film, the multiple in-gap peakstructure evolves into a single zero-bias conductance peak (ZBCP). Theoreticalsimulations suggest that the measurements are consistent with the scenario thatthe increasing magnetic field drives the nanoribbons from a multi-channeloccupied regime to a single channel occupied regime, and that the ZBCP may beinduced by zero energy Majorana modes as previously predicted [24]. Althoughfurther experiments are needed to clarify the nature of the ZBCP, we provideinitial evidence that quasi-1D QAHI nanoribbon/superconductor heterostructuresare new and promising platforms for realizing zero-energy Majorana modes.

cell reports physical science

Proximity-induced quasi-one-dimensional superconducting quantum  anomalous Hall state: a promising scalable top-down approach towards  localized Majorana modes