A Ge/Si heterostructure nanowire-based double quantum dot with integrated charge sensor

TY - JOUR

T1 - A Ge/Si heterostructure nanowire-based double quantum dot with integrated charge sensor

AU - Hu, Yongjie

AU - Churchill, Hugh

AU - Reilly, David

AU - Xiang, Jie

AU - Lieber, Charles

AU - M. Marcus, Charles

PY - 2007/6/15

Y1 - 2007/6/15

N2 - 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.

AB - 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.

KW - cond-mat.mes-hall

KW - cond-mat.mtrl-sci

U2 - 10.1038/nnano.2007.302

DO - 10.1038/nnano.2007.302

M3 - Journal article

C2 - 18654386

SN - 1748-3387

VL - 2

SP - 622

EP - 625

JO - Nature Nanotechnology

JF - Nature Nanotechnology

ER -