# Films of rhombohedral graphite as two-dimensional topological semimetals

## TL;DR

This paper explores thin films of rhombohedral graphite as two-dimensional topological semimetals with tunable Berry curvature and magnetic properties, revealing potential for novel electronic transport phenomena.

## Contribution

It demonstrates that rhombohedral graphite films maintain 2D topological states with large Berry curvature and magnetic moments, controllable via electrostatic gating.

## Key findings

- Large Berry curvature and magnetic moments in rhombohedral graphite films.
- Electrostatic gating tunes the anomalous Hall effect.
- Unique Landau level structure observed in these films.

## Abstract

Topologically non-trivial states characterized by Berry curvature appear in a number of materials ranging from spin-orbit-coupling driven topological insulators to graphene. In multivalley conductors, such as mono- and bilayer graphene, despite a zero total Chern number for the entire Brillouin zone, Berry curvature with different signs concentrated in different valleys can affect the observable material's transport characteristics. Here we consider thin films of rhombohedral graphite, which appear to retain truly two-dimensional properties up to tens of layers of thickness and host two-dimensional electron states with a large Berry curvature, accompanied by a giant intrinsic magnetic moment carried by electrons. The size of Berry curvature and magnetization in the vicinity of each valley can be controlled by electrostatic gating leading to a tuneable anomalous Hall effect and a peculiar structure of the two-dimensional Landau level spectrum.