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A quantum anomalous Hall (QAH) insulator coupled to an s-wave superconductor is predicted to harbor chiral Majorana modes. A recent experiment interprets the half-quantized two-terminal conductance plateau as evidence for these modes in a millimeter-size QAH-niobium hybrid device. However, non-Majorana mechanisms can also generate similar signatures, especially in disordered samples. Here, we studied similar hybrid devices with a well-controlled and transparent interface between the superconductor and the QAH insulator. When the devices are in the QAH state with well-aligned magnetization, the two-terminal conductance is always half-quantized. Our experiment provides a comprehensive understanding of the superconducting proximity effect observed in QAH-superconductor hybrid devices and shows that the half-quantized conductance plateau is unlikely to be induced by chiral Majorana fermions in samples with a highly transparent interface.more » « less
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Ren, Hechen ; Pientka, Falko ; Hart, Sean ; Pierce, Andrew T. ; Kosowsky, Michael ; Lunczer, Lukas ; Schlereth, Raimund ; Scharf, Benedikt ; Hankiewicz, Ewelina M. ; Molenkamp, Laurens W. ; et al ( , Nature)
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König, Markus ; Baenninger, Matthias ; Garcia, Andrei G. ; Harjee, Nahid ; Pruitt, Beth L. ; Ames, C. ; Leubner, Philipp ; Brüne, Christoph ; Buhmann, Hartmut ; Molenkamp, Laurens W. ; et al ( , Physical Review X)