Cooling a vibrational mode coupled to a molecular single-electron transistor

Details Cooling a vibrational mode coupled to a molecular single-electron transistor Cooling a vibrational mode coupled to a molecular single-electron transistor

2009-01-15

arxiv.org/abs/0901.2304v1

Journal of Low Temperature Physics 154, 5 (2009) 199

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 5 figures, to be published on J. Low Temp. Phys

Scientific paper

10.1007/s10909-009-9867-1

We consider a molecular single electron transistor coupled to a vibrational mode. For some values of the bias and gate voltage transport is possible only by absorption of one ore more phonons. The system acts then as a cooler for the mechanical mode at the condition that the electron temperature is lower than the phonon temperature. The final effective temperature of the vibrational mode depends strongly on the bias conditions and can be lower or higher of the reservoir in contact with the oscillator. We discuss the efficiency of this method, in particular we find that there is an optimal value for the electron-phonon coupling that maximizes cooling.

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