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CAMP Seminar: Creating Majorana Fermions on the Edge of InAs/GaSb Quantum Wells

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CAMP Seminar by Rui-Rui Du (Rice University)
When
05 November 2013 from 3:30 PM to 5:00 PM
Where
339 Davey Laboratory
Contact Name
Contact Phone
(814) 863-0016
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In our quest of Majorana femions in condensed matter, superconductor-proximity coupled 1D quantum wires ("Majorana wires") represent a promising system. The requirements for materials quality, however, are rather stringent: among the least of them the wires must be pure and uniform enough, such that the occupied number of modes will be the same over at least several mirometers length. We demonstrate here, by research of Rice group and collaborators, that these requirements can be readily met by creating and gating the helical edge states in a new 2D topological insulator, namely, the inverted InAs/GaSb semiconductor quantum wells. Single mode, spin polarized edges with coherent length over 5 mirometers are routinely observed at liquid helium temperature. This recent materials breakthrough, together with the fact that highly transparent interfaces can be formed between InAs/GaSb and superconductors, opens a well-controlled way of creating and manipulating Majoranas in the lab.

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