Piezoresistive heat engine and refrigerator

Details Piezoresistive heat engine and refrigerator Piezoresistive heat engine and refrigerator

2010-01-19

arxiv.org/abs/1001.3170v2

Nature Physics 7, 354-359 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Updated version after publication to make it almost identical to the Nature Physics article. During the review process the pre

Scientific paper

10.1038/NPHYS1871

Heat engines provide most of our mechanical power and are essential for transportation on macroscopic scale. However, although significant progress has been made in the miniaturization of electrostatic engines, it has proven difficult to reduce the size of liquid or gas driven heat engines below 10^7 um^3. Here we demonstrate that a crystalline silicon structure operates as a cyclic piezoresistive heat engine when it is driven by a sufficiently high DC current. A 0.34 um^3 engine beam draws heat from the DC current using the piezoresistive effect and converts it into mechanical work by expansion and contraction at different temperatures. This mechanical power drives a silicon resonator of 1.1x10^3 um^3 into sustained oscillation. Even below the oscillation threshold the engine beam continues to amplify the resonator's Brownian motion. When its thermodynamic cycle is inverted, the structure is shown to reduce these thermal fluctuations, therefore operating as a refrigerator.

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