Bistable spin currents from quantum dots embedded in a microcavity

Ivana Djuric, Chris P. Search

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

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.

Original languageEnglish
Article number155307
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number15
DOIs
StatePublished - 5 Apr 2007

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