Strong electron-hole exchange in coherently coupled quantum dots

Stefan Fält, Mete Atatüre, Hakan E. Türeci, Yong Zhao, Antonio Badolato, Atac Imamoglu

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


We have investigated few-body states in vertically stacked quantum dots. Because of a small interdot tunneling rate, the coupling in our system is in a previously unexplored regime where electron-hole exchange plays a prominent role. By tuning the gate bias, we are able to turn this coupling off and study a complementary regime where total electron spin is a good quantum number. The use of differential transmission allows us to obtain unambiguous signatures of the interplay between electron and hole-spin interactions. Small tunnel coupling also enables us to demonstrate all-optical charge sensing, where a conditional exciton energy shift in one dot identifies the charging state of the coupled partner.

Original languageEnglish (US)
Article number106401
JournalPhysical review letters
Issue number10
StatePublished - Mar 11 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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