Chang1-2020

Chang1-2020

Schematic of superconductor combined with quantum anomolous Hall insulator

An exotic quantum state known as a “chiral Majorana fermion” is predicted in devices wherein a superconductor is affixed on top of a quantum anomalous Hall (QAH)  insulator (left panel). Experiments performed at Penn State and the University of Würzburg in Germany show that the millimeter-size superconductor strip used in the proposed device geometry creates an electrical short, preventing the detection of chiral Majoranas (right panel).

IMAGE: Cui-Zu Chang, Penn State