Perpendicular electronic transport and moir\'{e}-induced resonance in twisted interfaces of three-dimensional graphite

TL;DR

This study investigates how twisting affects electrical conductivity in three-dimensional graphite, revealing resonance phenomena linked to flat bands and matching experimental conductance peaks.

Contribution

It introduces a theoretical framework to analyze perpendicular transport in twisted graphite, highlighting Fano resonance effects and reproducing experimental conductance features.

Findings

Conductivity exhibits nonmonotonic behavior with twist angle below 2°.

Fano resonance causes peaks and dips in conductance.

The model reproduces experimentally observed conductance peaks near 21.8°.

Abstract

We calculate the perpendicular electrical conductivity in twisted three-dimensional graphite (rotationally stacked graphite pieces) by using the effective continuum model and the recursive Green's function method. In the low twist angle regime $(\theta \lesssim 2^\circ)$, the conductivity shows a nonmonotonic dependence with a peak and dip structure as a function of the twist angle. By analyzing the momentum-resolved conductance and the local density of states, this behavior is attributed to the Fano resonance between continuum states of bulk graphite and interface-localized states, which is a remnant of the flat band in the magic-angle twisted bilayer graphene. We also apply the formulation to the high-angle regime near the commensurate angle $\theta \approx 21.8^\circ$, and reproduce the conductance peak observed in the experiment.