Turning excitons to the dark side

Noriaki Horiuchi

Christine Middleton

Maria Maragkou

Anonymous

Monique Combescot, Odile Betbeder-Matibet, V. Voliotis

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.

Monique Combescot, Odile Betbeder-Matibet, V. Voliotis

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.