Phonon Cooling of Nanomechanical Beams with Tunnel Junctions
Phonon Cooling of Nanomechanical Beams with Tunnel Junctions
We demonstrate electronic cooling of 1D phonon modes in suspended nanowires for the first time, using normal-metal-insulator-superconductor (N-I-S) tunnel junctions. Simultaneous cooling of both electrons and phonons to a common temperature was achieved. In comparison with nonsuspended devices, better cooling performance is achieved in the whole operating range of bath …