R. G. Herb Condensed Matter Seminars

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Events During the Week of February 5th through February 12th, 2017

Monday, February 6th, 2017

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Tuesday, February 7th, 2017

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Wednesday, February 8th, 2017

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Thursday, February 9th, 2017

Two-dimensional epitaxial superconductor-semiconductor heterostructures: A platform for topological superconducting networks
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Javad Shabani , City College, City University of New York
Abstract: Progress in the emergent field of topological superconductivity relies on synthesis of new material combining superconductivity, low density, and spin-orbit coupling. For example, theory indicates that the interface between a one-dimensional semiconductor with strong spin orbit coupling and a superconductor hosts Majorana modes with nontrivial topological properties. Recently, epitaxial growth of Al on InAs nanowires was shown to yield a high quality superconductor-semiconductor (S-Sm) system with uniformly transparent interfaces and a hard induced gap, indicted by strongly suppressed subgap tunneling conductance. Here we report the realization of a two-dimensional (2D) InAs/InGaAs heterostructure with epitaxial Al, yielding a planar S-Sm system with structural and transport characteristics as good as the epitaxial wires. The realization of 2D epitaxial S-Sm systems represent a significant advance over wires, allowing extended networks via top-down processing. Among numerous potential applications, this new material system can serve as a platform for complex networks of topological superconductors with gate-controlled Majorana zero modes. We demonstrate gateable Josephson junctions and a highly transparent 2D S-Sm interface based on the product of excess current and normal state resistance.

Host: Vavilov
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Friday, February 10th, 2017

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