Phys. Rev. B 81, 073403 (2010) [4 pages]Effects of a quantum measurement on the electric conductivity: Application to grapheneReceived 9 December 2009; published 8 February 2010 We generalize the standard linear-response (Kubo) theory to obtain the conductivity of a system that is subject to a quantum measurement of the current. Our approach can be used to specifically elucidate how back-action inherent to quantum measurements affects electronic transport. To illustrate the utility of our general formalism, we calculate the frequency-dependent conductivity of graphene and discuss the effect of measurement-induced decoherence on its value in the dc limit. We are able to resolve an ambiguity related to the parametric dependence of the minimal conductivity. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.81.073403
DOI:
10.1103/PhysRevB.81.073403
PACS:
72.10.Bg, 03.65.Ta, 73.23.-b, 81.05.U-
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