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

A. Anaya·M. Bowman·A. L. Korotkov·D. Davidovic
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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 $τ_ϕ(E,T)$ 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, $h/τ_ϕ(E,T) \approx E$, 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.

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A. Anaya, M. Bowman, A. L. Korotkov, D. Davidovic. 2005-12-01. Spin-Based Magnetofingerprints and Dephasing in Strongly Disordered Au-Nanobridges. https://doi.org/10.1103/physrevb.72.035452

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