Spin-blockade spectroscopy of a two-level artificial molecule

Abstract

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.

4 pages, 4 figures; revised version with a minor change in Fig.2 and additional inset in Fig.3.;accepted by PRL

References in corpus (7)

• Quantum Computation with Quantum Dots
• The Addition Spectrum of a Lateral Dot from Coulomb and Spin Blockade Spectroscopy
• Direct Coulomb and Exchange Interaction in Artificial Atoms
• Voltage-tunable singlet-triplet transition in lateral quantum dots
• The Collapse of the Spin-Singlet Phase in Quantum Dots
• Dissociation of vertical semiconductor diatomic artificial molecules
• Theory of the spin singlet filling factor $\nu =2$ quantum Hall droplet

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