Colloquium: "Quantized Majorana Conductance"

Date: 

Friday, December 1, 2017 - 11:00am

Location: 

ESB 1001

Speaker: 

Dr. Hao Zhang, Delft University of Technology

abstract

Majorana zero modes hold great promise for topological quantum computing. A tunneling current from a metallic probe into a Majorana zero mode gives rise to a zero bias conductance peak. The Majorana peak height is predicted to be robust and quantized at the universal conductance value, 2e2/h. This quantized height is robust and topologically protected from disorder and the tunnel coupling change, which will resolve a quantized conductance plateau when sweeping the corresponding gate voltage. However, all previous reports of Majorana signatures show zero bias peaks with height either much less than, or close but not robust near this quantized value. Here we demonstrate zero bias conductance peaks in Majorana nanowires. The peak height reaches the quantized value 2e2/h for the first time. This peak height stays robust at the quantized value against the tunnel coupling change, giving rise to a quantized Majorana conductance plateau.

bio

Hao Zhang received his B.S. in Physics from Peking University in 2010. He obtained his PhD in Physics (Albert Chang group) from Duke University in 2014, working on electron correlation effect in quantum point contacts. He started working as a postdoc in Leo Kouwenhoven group at Delft University of Technology since 2014. His current research focuses on Majorana zero modes in hybrid superconductor-semiconductor nanowire systems.

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