Bistable Spin Currents from Quantum Dots Embedded in a Microcavity

Abstract

We examine the spin current generated by quantum dots embedded in an optical microcavity. The dots are connected to leads, which allow electrons to tunnel into and out of the dot. The spin current is generated by spin flip transitions induced by a quantized electromagnetic field inside the cavity with one of the Zeeman states lying below the Fermi level of the leads and the other above. In the limit of strong Coulomb blockade, this model is analogous to the Jaynes-Cummings model in quantum optics. We find that the cavity field amplitude and the spin current exhibit bistability as a function of the laser amplitude, which is driving the cavity mode. Even in the limit of a single dot, the spin current and the Q distribution of the cavity field have a bimodal structure.

New version includes revised figures and discussion of results

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Cited by in corpus (3)

• Localized charge bifurcation in the coupled quantum dots
• Fine tuning of quantum operations performed via Raman transitions
• Quantum bistability and spin current shot noise of a single quantum dot coupled to an optical microcavity