Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-06-15
Nature Nanotechnology 2, 622 (2007).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Related work at http://marcuslab.harvard.edu and http://cmliris.harvard.edu
Scientific paper
Coupled electron spins in semiconductor double quantum dots hold promise as the basis for solid-state qubits. To date, most experiments have used III-V materials, in which coherence is limited by hyperfine interactions. Ge/Si heterostructure nanowires seem ideally suited to overcome this limitation: the predominance of spin-zero nuclei suppresses the hyperfine interaction and chemical synthesis creates a clean and defect-free system with highly controllable properties. Here we present a top gate-defined double quantum dot based on Ge/Si heterostructure nanowires with fully tunable coupling between the dots and to the leads. We also demonstrate a novel approach to charge sensing in a one-dimensional nanostructure by capacitively coupling the double dot to a single dot on an adjacent nanowire. The double quantum dot and integrated charge sensor serve as an essential building block required to form a solid-state spin qubit free of nuclear spin.
Churchill Hugh H. O.
Hu Yongjie
Lieber Charles M.
Marcus Charles M.
Reilly David J.
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