Quantum interference in a macroscopic van der Waals conductor

Abstract

Quantum corrections to charge transport can give rise to an oscillatory magnetoconductance, typically observed in mesoscopic samples with a length shorter than or comparable with the phase coherence length. Here, we report the observation of magnetoconductance oscillations periodic in magnetic field with an amplitude of the order of $e^2/h$ in macroscopic samples of Highly Oriented Pyrolytic Graphite (HOPG). The observed effect emerges when all carriers are confined to their lowest Landau levels. We argue that this quantum interference phenomenon can be explained by invoking moiré superlattices with a discrete distribution in periodicity. According to our results, when the magnetic length ${\ell }_B$, the Fermi wave length ${\lambda }_F$ and the length scale of fluctuations in local chemical potential are comparable in a layered conductor, quantum corrections can be detected over centimetric length scales.

Supplementary material on request

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Cited by in corpus (2)

• Temperature-driven changes in the Fermi surface of graphite
• Al'tshuler-Aronov-Spivak oscillations of bosonic matter-wave beams in the presence of interaction