Princeton University

School of Engineering & Applied Science

InAs heterostructures with superconducting contacts

Dr. Javad Shabani, University of California at Santa Barbara
Engineering Quadrangle, B418
Tuesday, February 17, 2015 - 11:00am

It has been recently realized that materials with strong spin orbit coupling can lead to novel states of matter such as topological insulators and superconductors. This exciting development might lead to a number of useful applications ranging from spintronics to quantum computing. In particular, theory predicts that narrow band gap semiconductors with strong spin-obit coupling are a suitable platform for the realization of Majorana zero-energy modes, predicted to obey exotic non-Abelian braiding statistics. In this talk, we demonstrate the first realization of gate-defined wires where one-dimensional confinement is created using electrostatic potentials, on large area InAs two-dimensional electron systems (2DESs). The electronic properties of the parent 2DES are fully characterized in the region that wires are formed. This allows us to quantitatively compare the effect of disorder in gate- and etched-defined wires. We show that this scheme together with epitaxial growth of superconducting thin film on InAs heterostructures could provide new prospective solutions for scalable and complex wire networks.