Single-charge detection by an atomic precision tunnel junction

M. G. House; E. Peretz; J. G. Keizer; S. J. Hile; M. Y. Simmons

doi:10.1063/1.4869032

Single-charge detection by an atomic precision tunnel junction

M. G. House, E. Peretz, J. G. Keizer, S. J. Hile, M. Y. Simmons

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14 Scopus citations

Abstract

We demonstrate sensitive detection of single charges using a planar tunnel junction 8.5 nm wide and 17.2 nm long defined by an atomically precise phosphorus doping profile in silicon. The conductance of the junction responds to a nearby gate potential and also to changes in the charge state of a quantum dot patterned 52 nm away. The response of this detector is monotonic across the entire working voltage range of the device, which will make it particularly useful for studying systems of multiple quantum dots. The charge sensitivity is maximized when the junction is most conductive, suggesting that more sensitive detection can be achieved by shortening the length of the junction to increase its conductance.

Original language	English
Article number	113111
Journal	Applied Physics Letters
Volume	104
Issue number	11
DOIs	https://doi.org/10.1063/1.4869032
State	Published - 17 Mar 2014
Externally published	Yes

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Single-charge detection by an atomic precision tunnel junction

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