Abstract
The undirectional model to the superconducting field-effect transistor (SFET) is shown to be thermodynamically unsound. A gate voltage which is controlled by the magnetic flux difference in a Josephson weak link is predicted by energy arguments. For a passive SFET model to be consistent with recent experimental observations of a charge-controlled critical current, a back-reaction from the DC drain-to-source flux (phase difference) to the DC gate voltage is required. As this effect is important in large devices and occurs at V/sub DS/=0, it does not appear to be directly related to charge-space energy bands or quasiparticle interference.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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