Time-dependent universal conductance fluctuations in mesoscopic Au wires: implications

Details Time-dependent universal conductance fluctuations in mesoscopic Au wires: implications Time-dependent universal conductance fluctuations in mesoscopic Au wires: implications

2006-07-31

arxiv.org/abs/cond-mat/0608003v2

Phys. Rev. B 75, 104202 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 9 figures, accepted to PRB

Scientific paper

10.1103/PhysRevB.75.104202

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 $L_{\phi}^{\rm WL}$ and $L_{\phi}^{\rm TDUCF}$ 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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