Phys. Rev. Lett. 102, 146602 (2009) [4 pages]Electronic Refrigeration of a Two-Dimensional Electron Gas
See accompanying Physics Viewpoint Measurements are presented of a device designed to cool a 6 μm2 region of 2D electron gas using quantum dots. Electrostatic effects are found to be significant in the device, and a model that accounts for them is developed. At ambient electron temperatures above 120 mK the results are consistent with the model and the base temperature of the cooled region is estimated. At an ambient electron temperature of 280 mK, the 6 μm2 region is found to be cooled below 190 mK. Below 120 mK the results deviate from predictions, which is attributed to reduced electron-electron scattering rates. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.146602
DOI:
10.1103/PhysRevLett.102.146602
PACS:
72.20.Pa, 73.23.Hk, 73.63.Kv
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