Selected Publications
 

Nonlinear thermovoltage in a single-electron transistor

P. A. Erdman, J. T. Peltonen, B. Bhandari, B. Dutta, H. Courtois, R. Fazio, F. Taddei, J. P. Pekola

We perform direct thermovoltage measurements in a single-electron transistor, using on-chip local thermometers, in both the linear and nonlinear regimes. Using a model which accounts for cotunneling, we find excellent agreement with the experimental data with no free parameters even when the temperature difference is larger than the average temperature (far-from-linear regime). This allows us to confirm the sensitivity of the thermovoltage on cotunneling and to find that in the nonlinear regime the temperature of the metallic island is a crucial parameter. Surprisingly, the metallic island tends to overheat even at zero net charge current, resulting in a reduction of the thermovoltage.


Phys. Rev. B 99, 165405 (2019)

doi: 10.1103/PhysRevB.99.165405