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By T. Ihn, R. Schleser, M. Sigrist, K. Ensslin, M. Reinwald and W. Wegscheider


Quantum dots fabricated by local anodic oxidation have proven to be state-of-the-art quantum systems comparable in quality to structures made by conventional electronbeam lithography. The most recent progress made in fabrication of such structures, the so-called multiple layer local oxidation [1], will be presented. A structure fabricated with this technique will be discussed that realizes a few-electron quantum dot with chargereadout and exhibits the signatures of quantum dot hydrogen and helium. The main focus will then be on the investigation of elastic and inelastic cotunneling processes. We have recently observed signatures of electron transport within the Coulomb-blockade which can be attributed to sequential tunneling mediated by inelastic cotunneling processes [2]. These findings allow us to broaden our understanding of transport in the blockade beyond the processes observed previously. Most recent experiments investigate a double quantum dot embedded in an Aharonov-Bohm (AB) interferometer. When the double dot system is tuned into the Coulombblockade regime, pronounced AB oscillations can still be observed giving evidence for a large phase-coherent contribution to the cotunneling current. At finite bias voltages w

Year: 2010
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