Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-07-18
Phys. Rev. Lett. 100, 027202 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
New title. Published version
Scientific paper
10.1103/PhysRevLett.100.027202
We propose a way to measure the momentum p of a nanomechanical oscillator. The p-detector is based on two tunnel junctions in a Aharonov-Bohm-type setup. One of the tunneling amplitudes depends on the motion of the oscillator, the other one not. Although the coupling between the detector and the oscillator is assumed to be linear in the position x of the oscillator, it turns out that the finite-frequency noise output of the detector will in general contain a term proportional to the momentum spectrum of the oscillator. This is a true quantum phenomenon, which can be realized in practice if the phase of the tunneling amplitude of the detector is tuned by the Aharonov-Bohm flux Phi to a p-sensitive value.
Bruder Christoph
Doiron C. B.
Trauzettel Björn
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