title: Strong electron-hole exchange in coherently coupled quantum dots.
abstract: 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.
authors: Institute of Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
authors: Stefan
authors: S
authors: Fält
authors: Mete
authors: M
authors: Atatüre
authors: Hakan E
authors: HE
authors: Türeci
authors: Yong
authors: Y
authors: Zhao
authors: Antonio
authors: A
authors: Badolato
authors: Atac
authors: A
authors: Imamoglu