Determination of the complex microwave photoconductance of a single quantum dot

DOI to cite this document:: 10.5283/epub.11180

Qin, H. ; Simmel, F. ; Blick, R. H. ; Kotthaus, J. P. ; Wegscheider, Werner ; Bichler, Max

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Date of publication of this fulltext: 30 Nov 2009 13:48

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Abstract

A small quantum dot containing approximately 20 electrons is realized in a two-dimensional electron system of an AlxGa1-xAs/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 ...