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Paper detail

Spatial mapping and manipulation of two tunnel-coupled quantum dots

The metallic tip of a scanning force microscope operated at 300 mK is used to locally induce a potential in a fully controllable double quantum dot defined via local anodic oxidation in a GaAs/AlGaAs heterostructure. Using scanning gate techniques we record spatial images of the current through the sample for different numbers of electrons on the quantum dots (i.e., for different quantum states). Owing to the spatial resolution of current maps, we are able to determine the spatial position of the individual quantum dots, and investigate their apparent relative shifts due to the voltage applied to a single gate.

preprint2011arXivOpen access
Magdalena HuefnerBruno KuengStephan SchnezKlaus EnsslinThomas IhnMatthias ReinwaldWerner Wegscheider
cond-mat.mes-hall
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Magdalena HuefnerBruno KuengStephan SchnezKlaus EnsslinThomas IhnMatthias ReinwaldWerner Wegscheider

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