Intrinsic Decoherence in Mesoscopic Systems

Abstract

We present measurements of the phase coherence time ${\tau }_{\varphi }$ in six quasi-1D Au wires and clearly show that ${\tau }_{\varphi }$ is temperature independent at low temperatures. We suggest that zero-point fluctuations of the intrinsic electromagnetic environment are responsible for the observed saturation of ${\tau }_{\varphi }$. We introduce a new functional form for the temperature dependence and present the results of a calculation for the saturation value of ${\tau }_{\varphi }$. This explains the observed temperature dependence of our samples as well as many 1D and 2D systems reported to date.

4 pages, 4 figures & 1 table

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