Spin-Based Magnetofingerprints and Dephasing in Strongly Disordered Au-Nanobridges

Abstract

We investigate quantum interference effects with magnetic field (magnetofingerprints) in strongly disordered Au-nanobridges. The magnetofingerprints are unconventional because they are caused by the Zeeman effect, not by the Aharonov-Bohm effect. These spin-based magnetofingerprints are equivalent to the Ericson's fluctuations (the fluctuations in electron transmission probability with electron energy). We present a model based on the Landauer-Buttiker formalism that describes the data. We show that the dephasing time ${\tau }_{\varphi }(E,T)$ of electrons at temperature $T$ and energy $E$ above the Fermi level can be obtained from the correlation magnetic field. In samples with localization length comparable to sample size, $h/{\tau }_{\varphi }(E,T)\approx E$, for $E\gg k_{B}T$, which shows that the Fermi liquid description of electron transport breaks down at length scale comparable to the localization length.

10 pages, 8 figures

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