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Bloch oscillating transistor (BOT) is a novel type of low noise amplifier, the
operation of which takes advantage of the band structure of a mesoscopic
Josephson junction (JJ) in a resistively isolated environment. It is a
charge-charge pulse converter where one single quasiparticle triggers a
sequence of Cooper pairs, thus yielding a current gain determined by the
conversion efficiency.
In general, the BOT can be considered as a complementary component of the
SET, in the same fashion as the BJT (bipolar junction transistor) is
complementary to the Field Effect Transistor. In other words, BOTs may
replace SQUIDs in current read-out applications at large impedance levels on
the order of 1 MOhms.
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Animation of the operating principle of a Bloch Oscillating Transistor. Gain
is given by 2N where N is the number of Bloch oscillations triggered by a
quasiparticle. |
