Logic elements have been demonstrated using single-electron tunnelling transistors. The transistors are biased at different positions in the conductance oscillation cycle so that they are analogous to either n-type or p-type transistors. The circuit operation is stable at a temperature of 1.6 K despite the low gain of the transistors.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19991231
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