Scattering Theory of Mesoscopic Detectors

Details Scattering Theory of Mesoscopic Detectors Scattering Theory of Mesoscopic Detectors

2002-10-28

arxiv.org/abs/cond-mat/0210612v3

Surface Science, 532-535, 617-622 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

contribution to the ECOSS-21 proceedings in a special issue of SURFACE SCIENCE

Scientific paper

10.1016/S0039-6028(03)00235-8

We consider a two-level system coupled to a mesoscopic two-terminal conductor that acts as measuring device. As a convenient description of the conductor we introduce its scattering matrix. We show how its elements can be used to calculate the relaxation and decoherence rates of the two-level system. Special emphasis is laid on the charge screening in the conductor that becomes important in the many-channel limit. Finally we give some examples that illustrate charge screening in different limits.

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