Applications of nonequilibrium Kubo formula to the detection of quantum noise

Details Applications of nonequilibrium Kubo formula to the detection of quantum noise Applications of nonequilibrium Kubo formula to the detection of quantum noise

2004-04-12

arxiv.org/abs/cond-mat/0404270v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, Invited talk to be given by Y. I. at the SPIE Noise Conference, Grand Canary, June 2004. Added reference and 2 footn

Scientific paper

10.1117/12.544597

The Kubo fluctuation-dissipation theorem relates the current fluctuations of a system in an equilibrium state with the linear AC-conductance. This theorem holds also out of equilibrium provided that the system is in a stationary state and that the linear conductance is replaced by the (dynamic) conductance with respect to the non equilibrium state. We provide a simple proof for that statement and then apply it in two cases. We first show that in an excess noise measurement at zero temperature, in which the impedance matching is maintained while driving a mesoscopic sample out of equilibrium, it is the nonsymmetrized noise power spectrum which is measured, even if the bare measurement, i.e. without extracting the excess part of the noise, obtains the symmetrized noise. As a second application we derive a commutation relation for the two components of fermionic or bosonic currents which holds in every stationary state and which is a generalization of the one valid only for bosonic currents. As is usually the case, such a commutation relation can be used e.g. to derive Heisenberg uncertainty relationships among these current components.

Affiliated with

Also associated with

No associations

Rating

Applications of nonequilibrium Kubo formula to the detection of quantum noise does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Applications of nonequilibrium Kubo formula to the detection of quantum noise, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Applications of nonequilibrium Kubo formula to the detection of quantum noise will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-246969