Time-dependent universal conductance fluctuations in mesoscopic Au wires: implications
A. Trionfi, S. Lee, D. Natelson
Abstract
In cold, mesoscopic conductors, two-level fluctuators lead to time-dependent universal conductance fluctuations (TDUCF) manifested as 1/f noise. In Au nanowires, we measure the magnetic field dependence of TDUCF, weak localization (WL), and magnetic field-driven (MF) UCF before and after treatments that alter magnetic scattering and passivate surface fluctuators. Inconsistencies between Lϕ WL and Lϕ TDUCF strongly suggest either that the theory of these mesoscopic phenomena in weakly disordered, highly pure Au is incomplete, or that the assumption that the TDUCF frequency dependence remains 1/f to very high frequencies is incorrect. In the latter case, TDUCF in excess of 1/f expectations may have implications for decoherence in solid-state qubits.
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