Chiral Majorana fermion modes in a quantum anomalous Hall insulator-superconductor structure

We report transport measurements that suggest the existence of one-dimensional chiral Majorana fermion modes in the hybrid system of a quantum anomalous Hall insulator thin film coupled with a superconductor. As the external magnetic field is swept, half-integer quantized conductance plateaus are observed at the locations of magnetization reversals, giving a distinct signature of the Majorana fermion modes. This transport signature is reproducible over many magnetic field sweeps and appears at different temperatures. This finding may open up an avenue to control Majorana fermions for implementing robust topological quantum computing.

Source: ScienceNOW - July 20, 2017 Category: Science Authors: He, Q. L., Pan, L., Stern, A. L., Burks, E. C., Che, X., Yin, G., Wang, J., Lian, B., Zhou, Q., Choi, E. S., Murata, K., Kou, X., Chen, Z., Nie, T., Shao, Q., Fan, Y., Zhang, S.-C., Liu, K., Xia, J., Wang, K. L. Tags: Physics reports Source Type: news