Strong Electron-Hole Exchange in Coherently Coupled Quantum Dots

Stefan Fält, Mete Atatüre, Hakan E. Türeci, Yong Zhao, Antonio Badolato, and Atac Imamoglu
Phys. Rev. Lett. 100, 106401 – Published 11 March 2008

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.

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  • Received 17 July 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.106401

©2008 American Physical Society

Authors & Affiliations

Stefan Fält1, Mete Atatüre2, Hakan E. Türeci1, Yong Zhao3, Antonio Badolato1, and Atac Imamoglu1

  • 1Institute of Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland
  • 2Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom
  • 3Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany

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Vol. 100, Iss. 10 — 14 March 2008

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