A non-invasive electron thermometer based on charge sensing of a quantum dot.

Authors :: Mavalankar, A.
Chorley, S. J.
Griffiths, J.
Jones, G. A. C.
Farrer, I.
Ritchie, D. A.
Smith, C. G.
Source :: Applied Physics Letters. 9/23/2013, Vol. 103 Issue 13, p133116-133116-4. 1p. 1 Diagram, 3 Graphs.
Publication Year :: 2013
Abstract: We present a thermometry scheme to extract the temperature of a two-dimensional electron gas by monitoring the charge occupation of a weakly tunnel-coupled 'thermometer' quantum dot using a quantum point contact detector. Electronic temperatures between 120 and 951 mK are measured with an accuracy of better than 1 mK in the best case, and agree with the lattice temperature measured by a resistance thermometer. The thermometer is non-invasive and does not pass a current through the electron system being measured. The tuning is independent of temperature, and the device is robust in a magnetic field up to 5.6 T. [ABSTRACT FROM AUTHOR]