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Abstract: We calculate the nonlinear cotunneling conductance through a quantum dot with3 electrons occupying the three highest lying energy levels. Starting from a3-orbital Anderson model, we apply a generalized Schrieffer-Wolfftransformation to derive an effective Kondo model for the system. Within thismodel we calculate the nonequilibrium occupation numbers and the correspondingcotunneling current to leading order in the exchange couplings. We identify theinelastic cotunneling thresholds and their splittings with applied magneticfield, and make a qualitative comparison to recent experimental data on carbonnanotube and InAs quantum-wire quantum dots. Further predictions of the modellike cascade resonances and a magnetic-field dependence of the orbital levelsplitting are not yet observed but within reach of recent experimental work oncarbon nanotube and InAs nanowire quantum dots.



Autor: S. Schmaus, V. Koerting, J. Paaske, T. S. Jespersen, J. Nygård, P. Wölfle

Fuente: https://arxiv.org/







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