Oscillatory persistent currents in self-assembled quantum rings.

This work is part of the research program of NanoNed and FOM, which are financially supported by the NWO (The Netherlands). This work was supported by the FWOV projects No. G.0435.03, No. G.0449.04, the WOG No. WO.035.04N (Belgium), the NANOSELF II (No. TEC-2005-05781-C03-01), the MEC (Consolider-Ingenio 2010 ‘‘QOIT’’, No. CSD2006-00019) (Spain)and the EC SANDiE Network of Excellence (No. NMP4-CT-2004-500101).