Inelatic cotunneling current and shot noise of an interacting quantum dot with ferromagnetic correlations

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dc.creatorDong, Bing
dc.creatorLei, X. L.
dc.creatorHoring, Norman J. M.
dc.date2005-09-05
dc.date2006-11-23
dc.date.accessioned2026-07-07T08:49:44Z
dc.date.available2026-07-07T08:49:44Z
dc.descriptionWe explore inelastic cotunneling through a strongly Coulomb-blockaded quantum dot attached to two ferromagnetic leads in the weak coupling limit using a generic quantum Langevin equation approach. We first develop a Bloch-type equation microscopically to describe the cotunneling-induced spin relaxation dynamics, and then develop explicit analytical expressions for the local magnetization, current, and its fluctuations. On this basis, we predict a novel zero-bias anomaly of the differential conductance in the absence of a magnetic field for the anti-parallel configuration, and asymmetric peak splitting in a magnetic field. Also, for the same system with large polarization, we find a negative zero-frequency differential shot noise in the low positive bias-voltage region. All these effects are ascribed to rapid spin-reversal due to underlying spin-flip cotunneling.
dc.description7 pages, 5 figures, submitted
dc.identifierhttps://arxiv.org/abs/cond-mat/0509098
dc.identifierhttp://arxiv.org/abs/cond-mat/0509098
dc.identifierCommun. Theoret. Phys. 48, 1099 (2007).
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/144406
dc.subjectMesoscale and Nanoscale Physics
dc.titleInelatic cotunneling current and shot noise of an interacting quantum dot with ferromagnetic correlations
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