Magnetotransport in a graphite cylinder under quantizing fields

TL;DR

This study investigates how the curvature of a graphite cylinder affects its magnetotransport properties under strong magnetic fields, revealing angle-dependent oscillations and proposing a network model to explain these effects.

Contribution

It introduces a network model that explains magnetotransport in curved graphite, highlighting the influence of geometry and magnetic field inhomogeneity on electronic behavior.

Findings

Angle-dependent Shubnikov-de Hass oscillations observed

Model reproduces experimental magnetotransport features

Curvature enables tunable spatial current densities

Abstract

We analyze the transport properties of curved, three-dimensional graphite samples in strong magnetic fields. Focusing on a millimeter-scale graphite cylinder as a prototypical curved object, we perform longitudinal and Hall voltage measurements while applying quantizing magnetic fields. These measurements are investigated as a function of field strength and angles. Most importantly, we find that angle-dependent Shubnikov-de Hass oscillations are superimposed with angle-independent features. Reproducing the experimental observations, we introduce a network model that accounts for the cylindrical geometry effect by conceptualizing the cylinder as composed of strips of planar graphite in an effectively inhomogeneous magnetic field. Our work highlights how the interplay between geometric curvature and quantizing magnetic fields can be leveraged to engineer tunable spatial current densities within solid-state systems, and paves the way for understanding transport properties of curved and bent three-dimensional samples more generally.