Strong Electron-Hole Exchange in Coherently Coupled Quantum Dots

Details Strong Electron-Hole Exchange in Coherently Coupled Quantum Dots Strong Electron-Hole Exchange in Coherently Coupled Quantum Dots

2007-07-16

arxiv.org/abs/0707.2111v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.100.106401

We have investigated few-body states in vertically stacked quantum dots. Due to small inter-dot tunneling rate, the coupling in our system is in a previously unexplored regime where electron-hole exchange is the dominant spin interaction. 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 conditional exciton energy shift in one dot identifies the charging state of the coupled partner.

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