Europhys. Lett.
Volume 74, Number 5, June 2006
Page(s) 868 - 874
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 03 May 2006
Europhys. Lett., 74 (5), pp. 868-874 (2006)
DOI: 10.1209/epl/i2006-10033-9

Electron teleportation between quantum dots using virtual dark exciton

M. Combescot, O. Betbeder-Matibet and V. Voliotis

INSP, Université Pierre et Marie Curie-Paris 6, Université Denis Diderot-Paris 7 CNRS, UMR 7588, Campus Boucicaut - 140 rue de Lourmel, 75015 Paris, France

received 8 February 2006; accepted in final form 3 April 2006
published online 3 May 2006

We here propose a mechanism to teleport electrons between quantum dots through the transformation of a virtual bright exciton into a dark exciton. This mechanism relies on the interactions of two composite bosons: a pair of electrons with opposite spins, trapped in two dots and an electron-hole pair in a free exciton coupled to an unabsorbed pump pulse, which makes it "bright" but virtual. This bright exciton first turns "dark" by dropping its electron and stealing the trapped electron with opposite spin through an exchange Coulomb process with the trapped pair. In a second step, the dark exciton "flies" with its electron to the other dot where it turns bright again, by the inverse process. The "Shiva diagrams" for composite-boson many-body effects that we have recently introduced, enlighten this understanding.

71.35.-y - Excitons and related phenomena.

© EDP Sciences 2006