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Solid state Stern-Gerlach spin-splitter for magnetic field sensoring, spintronics, and quantum computing
(English)Manuscript (preprint) (Other academic)
Abstract [en]

We show that the edge of a two-dimensional topological insulator can be used to construct a solid state Stern-Gerlach spin-splitter. By threading such a Stern-Gerlach apparatus with a magnetic flux, Ahranov-Bohm like interference effects are introduced. Using ferromagnetic leads, the setup can be used to both measure magnetic flux and as a spintronics switch. With normal metallic leads a switchable spintronics NOT-gate can be implemented. Furthermore, we show that a sequence of such devices can be used to construct a single-qubit SU(2)-gate, one of the two gates required for a universal quantum computer. The field sensitivity, or switching field, b is related to the device characteristic size r through b=ℏ/qr2, with q the unit of electric charge.

National Category
Condensed Matter Physics Physical Sciences
URN: urn:nbn:se:uu:diva-305211OAI: oai:DiVA.org:uu-305211DiVA: diva2:1034718
Available from: 2016-10-12 Created: 2016-10-12 Last updated: 2016-10-12

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