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In the present thesis electronic transport through mesoscopic spintronic devices is investigated. This is particularly interesting since such structures have already proven industrial relevance and they additionally give rise to future information technology applications. As a result of the continuing trend of miniaturization in electronics modern spintronic structures have already reached the nanometer scale. However, a further size reduction may soon be prevented by the laws of quantum mechanics. Hence conceptually new kinds of devices that take advantage of the possibilities of quantum phenomena may need to be adopted. Prominent examples of such spintronic structures are ferromagnetic single-electron transistors (fm SETs). They rely on quantum tunneling, exploit the intrinsic electron spin, and allow for the switching and amplifi...
Comment: 12 pages, proceedings of the NATO ARW MQO, Bled, Slovenia
Comment: 19 pages, 5 figures, considerably extended and corrected version
Comment: 6 pages, 1 figure, detailed proof of weak positivity and Bell-type inequality
We study the quantum noise of electronic current in a double barrier system with a single resonant level. In the framework of the Landauer formalism we treat the double barrier as a quantum coherent scattering region that can exchange photons with a coupled electric field, e.g. a laser beam or a periodic ac-bias voltage. As a consequence of the manyfold parameters that are involved in this system, a complicated step-like structure arises in the non-symmetrized current-current auto correlation spectrum and a peak-like structure in the cross correlation spectrum with and without harmonic ac-driving. We present an analytic solution for these noise spectral functions by assuming a Breit-Wigner lineshape. In detail we study how the correlation functions are affected by photo-assisted tunneling (PAT) events and discuss the underlying eleme...
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