Molecular states in a one-electron double quantum dot

Hüttel, A. K.; Ludwig, S.; Lorenz, H.; Eberl, K.; Kotthaus, J. P.

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Molecular states in a one-electron double quantum dot

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Eberl, K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Hüttel, A. K., Ludwig, S., Lorenz, H., Eberl, K., & Kotthaus, J. P. (2006). Molecular states in a one-electron double quantum dot. Physica E, 34(1-2), 488-492.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FAFF-A

Abstract

The transport spectrum of a strongly tunnel-coupled one-electron double
quantum dot electrostatically defined in a GaAs/AlGaAs heterostructure
is studied. At finite source-drain-voltage we demonstrate the
unambiguous identification of the symmetric ground state and the
antisymmetric excited state of the double well potential by means of
differential conductance measurements. A magnetic field, perpendicular
to the two-dimensional electron gas, reduces the extent of the
electronic wave-function and thereby decreases the tunnel coupling.
This magnetic field also modulates the orbital excitation energies in
each individual dot. By additionally tuning the asymmetry of the double
well potential we can align the chemical potentials of an excited state
of one of the quantum dots and the ground state of the other quantum
dot. This results in a second anticrossing with a much larger tunnel
splitting than the anticrossing involving the two electronic ground
states. (c) 2006 Elsevier B.V. All rights reserved.