Tunneling effects on fine-structure splitting in quantum-dot molecules

Hanz Y. Ramírez, Shun-Jen Cheng

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


We theoretically study the effects of bias-controlled interdot tunneling in vertically coupled quantum dots on the emission properties of spin excitons in various bias-controlled tunneling regimes. As a main result, we predict substantial reduction of optical fine-structure splitting without any drop in the optical oscillator strength for the coupled dots with high tunneling rates. This special reduction diminishes the distinguishability of polarized decay paths in cascade emission processes suggesting the use of stacked quantum-dot molecules as entangled photon-pair sources.

Original languageEnglish
Article number206402
JournalPhysical Review Letters
Issue number20
StatePublished - 18 May 2010


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