A fast, primary Coulomb blockade thermometer

Bergsten, Tobias; Claeson, Tord; Delsing, Per
February 2001
Applied Physics Letters;2/26/2001, Vol. 78 Issue 9, p1264
Academic Journal
We have measured the third derivative of the current-voltage characteristics, d[sup 3]I/dV[sup 3], in a two-dimensional array of small tunnel junctions using a lock-in amplifier. We show that this derivative is zero at a voltage which scales linearly with the temperature and depends only on the temperature and natural constants, thus providing a primary thermometer. We demonstrate a measurement method which extracts the zero crossing voltage directly using a feedback circuit. This method requires only one voltage measurement, which makes it substantially faster than the original Coulomb blockade thermometry method. © 2001 American Institute of Physics.


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