Universal conductance fluctuations (UCF) in mesoscopic physics is a phenomenon encountered in electrical transport experiments in mesoscopic species.
The measured electrical conductance will vary from sample to sample, mainly due to inhomogeneous scattering sites.
Fluctuations originate from coherence effects for electronic wavefunctions and thus the phase-coherence length
UCF is more profound when electrical transport is in weak localization regime.
is the momentum relaxation due to phonon scattering events length or mean free path.
At zero temperature without decoherence, the UCF is influenced by mainly two factors, the symmetry and the shape of the sample.
Recently, a third key factor, anisotropy of Fermi surface, is also found to fundamentally influence the amplitude of UCF.
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