Coexistence of anomalous field effect and mesoscopic conductance fluctuations in granular aluminium
arXiv:0803.2764 · doi:10.1140/epjb/e2008-00317-4
Abstract
We perform electrical field effect measurements at 4 K on insulating granular aluminium thin films. When the samples size is reduced below 100 micrometers, reproducible and stable conductance fluctuations are seen as a function of the gate voltage. Our results suggest that these fluctuations reflect the incomplete self-averaging of largely distributed microscopic resistances. We also study the anomalous field effect (conductance dip) already known to exit in large samples and its slow conductance relaxation in the presence of the conductance fluctuations. Within our measurements accuracy, the two phenomena appear to be independent of each other, like two additive contributions to the conductance. We discuss the possible physical meaning of this independence and in particular whether or not this observation is in favor of an electron glass interpretation of slow conductance anomaly relaxations.
arXiv comment16 pages, 26 figures
References in corpus (20)
- Granular Electronic Systems
- Collective Transport in Arrays of Quantum Dots
- The glass transition and the Coulomb gap in electron glasses
- Time Dependent Development of the Coulomb Gap
- Oxygen stoichiometry and instability in aluminium oxide tunnel barrier layers
- Individual charge traps in silicon nanowires: Measurements of location, spin and occupation number by Coulomb blockade spectroscopy
- Symmetrical field effect and slow electron relaxation in granular aluminium
- The Memory Effect in Electron Glasses
- Off-equilibrium dynamics of the two-dimensional Coulomb glass
- Long time relaxation of interacting electrons in the regime of hopping conduction
- Evidence for growth of collective excitations in glasses at low temperatures
- Nonexponential Relaxations in a Two-Dimensional Electron System in Silicon
- Coulomb gap, Coulomb blockade, and dynamic activation energy in frustrated single-electron arrays
- Distribution Function Analysis of Mesoscopic Hopping Conductance Fluctuations
- Random background charges and Coulomb blockade in one-dimensional tunnel junction arrays
- Numerical study of relaxation in electron glasses
- The Electron-Glass in samples approaching the Mesoscopic regime
- Conductance statistics in small insulating GaAs:Si wires at low temperature. II. Experimental study
- Dielectric susceptibility of the Coulomb-glass
- Slow relaxation of conductance of amorphous hopping insulators
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- Electron glass effects in amorphous NbSi films
- Electrical glassy behavior in granular aluminium thin films
- Charging of highly resistive granular metal films
- Quantum Coulomb glass on the Bethe lattice
- Screening and conductance relaxations in insulating granular aluminium thin films
- Quantum Memory Effects in Disordered Systems and Their Relation to 1/f Noise
- Ageing in granular aluminium insulating thin films
- Weak localization and universal conductance fluctuations in large area twisted bilayer graphene