Electron spin-polarization via Zeeman and Aharonov-Bohm effects in a double quantum dot ring

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dc.contributor.advisor Hedin, Eric R.
dc.contributor.author Perkins, Abigail C. en_US
dc.date.accessioned 2011-06-09T15:33:34Z
dc.date.available 2011-06-09T15:33:34Z
dc.date.created 2009 en_US
dc.date.issued 2009
dc.identifier.uri http://cardinalscholar.bsu.edu/handle/123456789/193591
dc.description.abstract A nanoscale Aharonov-Bohm (AB) ring with a quantum dot (QD) embedded in each arm is investigated analytically to provide electron transmission characteristics. A parallel magnetic field provides Zeeman splitting of the QD energy levels. Combined Zeeman energy level splitting and AB-effects occur with a perpendicular field. In our device, the AB-ring interferometer, Zeeman splitting of the QD energy levels creates regions of parameter space in which the electron transmission is highly spin-polarized. In addition to Zeeman splitting caused by a parallel magnetic field, combined Zeeman energy level splitting and AB-interference effects occur with a perpendicular field. The weighted spin-polarization function is calculated and presented as a function of magnetic field and electron energy. Due to a unique parameter regime in which the AB-oscillations show extreme sharpening [1], the electron transmission can be tuned to produce spin-polarized currents which can be switched and controlled by small changes of external fields.
dc.description.sponsorship Department of Physics and Astronomy
dc.description.tableofcontents Introduction -- AB-oscillations and resonances in a double quantum dot ring -- Results for combined Zeeman and AB effects -- Spin-polarization.
dc.format.extent vi, 113 p. : digital, PDF file, ill. (some col.) en_US
dc.source CardinalScholar 1.0 en_US
dc.subject.lcsh Electrons -- Polarization. en_US
dc.subject.lcsh Quantum theory.
dc.subject.lcsh Quantum dots.
dc.title Electron spin-polarization via Zeeman and Aharonov-Bohm effects in a double quantum dot ring en_US
dc.title.alternative Electron spin polarization via Zeeman and Aharonov-Bohm effects in a double quantum dot ring en_US
dc.description.degree Thesis (M.S.)
dc.identifier.cardcat-url http://liblink.bsu.edu/catkey/1540705 en_US


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  • Master's Theses [5510]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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