Measuring Temperature Gradients over Nanometer Length Scales

Details Measuring Temperature Gradients over Nanometer Length Scales Measuring Temperature Gradients over Nanometer Length Scales

2009-01-16

arxiv.org/abs/0901.2383v1

Nano Lett., 2009, 9 (2), pp 779-783

Physics

Condensed Matter

Materials Science

6 pages, 5 figures

Scientific paper

10.1021/nl8034042

When a quantum dot is subjected to a thermal gradient, the temperature of electrons entering the dot can be determined from the dot's thermocurrent if the conductance spectrum and background temperature are known. We demonstrate this technique by measuring the temperature difference across a 15 nm quantum dot embedded in a nanowire. This technique can be used when the dot's energy states are separated by many kT and will enable future quantitative investigations of electron-phonon interaction, nonlinear thermoelectric effects, and the effciency of thermoelectric energy conversion in quantum dots.

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