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arXiv · 0708.1520

Coulomb blockade in a Si channel gated by an Al single-electron transistor

L. Sun·K. R. Brown·B. E. Kane
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Abstract

We incorporate an Al-AlO_x-Al single-electron transistor as the gate of a narrow (~100 nm) metal-oxide-semiconductor field-effect transistor (MOSFET). Near the MOSFET channel conductance threshold, we observe oscillations in the conductance associated with Coulomb blockade in the channel, revealing the formation of a Si single-electron transistor. Abrupt steps present in sweeps of the Al transistor conductance versus gate voltage are correlated with single-electron charging events in the Si transistor, and vice versa. Analysis of these correlations using a simple electrostatic model demonstrates that the two single-electron transistor islands are closely aligned, with an inter-island capacitance approximately equal to 1/3 of the total capacitance of the Si transistor island, indicating that the Si transistor is strongly coupled to the Al transistor.

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L. Sun, K. R. Brown, B. E. Kane. 2007-10-05. Coulomb blockade in a Si channel gated by an Al single-electron transistor. https://doi.org/10.1063/1.2793712

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