Abstract
Single-crystalline iridium dioxide nanowires show the time-dependent universal conductance fluctuations (TUCFs) at cryogenic temperatures. The conductance fluctuations persist up to temperature T as high as nearly 10 K. The root-mean-square TUCF magnitudes increase with decreasing T, reaching approximately 0.1 e2 / h at 1.7 K. We ascribe these conductance fluctuations to originating from the conduction electrons scattering upon mobile defects (moving scattering centers). Our measured TUCF characteristics are satisfactorily explained in terms of the existing TUCF theory in its three-dimensional form. The extracted electron dephasing length Lφ(1.7 K) ≃90 nm is smaller than the diameter (≈ 180 nm) of our nanowires.
Highlights
Quantum-interference effects often manifest in the electronic transport properties of miniature conductors at cryogenic temperatures [1,2]
As shown in the previous studies [4,16,17,18], this increased resistance distribution with decreasing temperature directly manifests the time-dependent universal conductance fluctuations (TUCFs) behavior whose origin is the existence of moving scattering centers in this particular nanowire
This resistance distribution reflects the presence of the TUCF phenomenon
Summary
Quantum-interference effects often manifest in the electronic transport properties of miniature conductors at cryogenic temperatures [1,2]. One of the experimental realizations of the marked quantum-interference effects is the observation of the universal conductance fluctuations (UCFs) [1,2,3] in Q1D metallic [4,5] and heavily doped semiconductor [6,7] nanowires. In sharp contrast to the classical thermal noise, the UCF magnitudes increase with reducing temperature T [8,9,10,11], owing to the inherent quantum nature of the electron waves traversing in a weakly random potential. In the limit of T → 0, the root-mean-square UCF magnitudes are theoretically predicted to reach a universal value of Ce2/h, where the constant C depends on sample dimensionality and is of order unity in one, two and three dimensions.
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