Optically Probing Spin and Charge Interactions in a Tunable Artificial Molecule

H. J. Krenner, E. C. Clark, T. Nakaoka, M. Bichler, C. Scheurer, G. Abstreiter, and J. J. Finley
Phys. Rev. Lett. 97, 076403 – Published 17 August 2006

Abstract

We optically probe and electrically control a single artificial molecule containing a well defined number of electrons. Charge and spin dependent interdot quantum couplings are probed optically by adding a single electron-hole pair and detecting the emission from negatively charged exciton states. Coulomb- and Pauli-blockade effects are directly observed, and tunnel coupling and electrostatic charging energies are independently measured. The interdot quantum coupling is shown to be mediated by electron tunneling. Our results are in excellent accord with calculations that provide a complete picture of negative excitons and few-electron states in quantum dot molecules.

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  • Received 28 April 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.076403

©2006 American Physical Society

Authors & Affiliations

H. J. Krenner1, E. C. Clark1, T. Nakaoka1, M. Bichler1, C. Scheurer2, G. Abstreiter1, and J. J. Finley1

  • 1Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 3, D-85748 Garching, Germany
  • 2Lehrstuhl für Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85748 Garching, Germany

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Issue

Vol. 97, Iss. 7 — 18 August 2006

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