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Superconducting Qubits Open Quantum Systems Decoherence

Detecting spin-polarized currents in ballistic nanostructures.

PubMed

Authors: Potok RM, Folk JA, Marcus CM, Umansky V

Year

2002

Paper ID

13078

Status

Peer-reviewed

Abstract Read

~2 min

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Abstract

We demonstrate a mesoscopic spin polarizer/analyzer system that allows the spin polarization of current from a quantum point contact in a large in-plane magnetic field to be measured. A transverse electron focusing geometry is used to couple current from an emitter point contact into a collector point contact. At large in-plane fields, with the point contacts biased to transmit only a single spin (g<e(2)/h), the voltage across the collector depends on the spin polarization of the current incident on it. Spin polarizations of >70% are found for both emitter and collector at 300 mK and 7 T in-plane field.

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We demonstrate a mesoscopic spin polarizer/analyzer system that allows the spin polarization of current from a quantum point contact in a large in-plane magnetic field to be...

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References & Citation Signals

[1] DOI https://doi.org/10.1103/PhysRevLett.89.266602 [2] Publisher https://pubmed.ncbi.nlm.nih.gov/12484844/

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