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Single charge sensing and transport in double quantum dots fabricated from commercially grown Si/SiGe heterostructures

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6 Author(s)
Payette, C. ; Department of Physics, Princeton University, Princeton, New Jersey 08544, USA ; Wang, K. ; Koppinen, P.J. ; Dovzhenko, Y.
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We perform quantum Hall measurements on three types of commercially available modulation-doped Si/SiGe heterostructures to determine their suitability for depletion gate defined quantum dot devices. By adjusting the growth parameters, we are able to achieve electron gases with charge densities 1–3 × 1011/cm2 and mobilities in excess of 100 000 cm2/Vs. Double quantum dot devices fabricated on these heterostructures show clear evidence of single charge transitions as measured in dc transport and charge sensing and exhibit electron temperatures of 100 mK in the single quantum dot regime.

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Applied Physics Letters  (Volume:100 ,  Issue: 4 )