H. Qin, F. Simmel, R. H. Blick, J. P. Kotthaus, W. Wegscheider, M. Bichler
Published 2000-03-10, updated 2000-11-10Version 2
A small quantum dot containing approximately 20 electrons is realized in a two-dimensional electron system of an AlGaAs/GaAs heterostructure. Conventional transport and microwave spectroscopy reveal the dot's electronic structure. By applying a coherently coupled two-source technique, we are able to determine the complex microwave induced tunnel current. The amplitude of this photoconductance resolves photon-assisted tunneling (PAT) in the non-linear regime through the ground state and an excited state as well. The out-of-phase component (susceptance) allows to study charge relaxation within the quantum dot on a time scale comparable to the microwave beat period.
Comments: 5.5 pages, 6 figures, accepted by Phys. Rev. B (Jan. B15 2001)
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