Spin-blockade spectroscopy of a two-level artificial molecule

M. Pioro-Ladriere (1 , 2) , M. Ciorga (1) , J. Lapointe (1) , P. Zawadzki (1) , M. Korkusinski (1) , P. Hawrylak (1) , A.S. Sachrajda (1) ((1) Institute for Microstructural Sciences

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National Research Council of Canada Ottawa Ontario Canada; (2)Centre de Recherche sur les Proprietes Electroniques de Materiaux Avances Universite de Sherbrooke Sherbrooke Quebec Canada)

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classification ❄️ cond-mat.mes-hall

keywords moleculespintwo-levelartificialatomsspectroscopyadditionbeen

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Coulomb and spin blockade spectroscopy investigations have been performed on an electrostatically defined ``artificial molecule'' connected to spin polarized leads. The molecule is first effectively reduced to a two-level system by placing both constituent atoms at a specific location of the level spectrum. The spin sensitivity of the conductance enables us to identify the electronic spin-states of the two-level molecule. We find in addition that the magnetic field induces variations in the tunnel coupling between the two atoms. The lateral nature of the device is evoked to explain this behavior.

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Spin-blockade spectroscopy of a two-level artificial molecule

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