Magneto tunnel conductance across twisted Weyl semimetal junctions

TL;DR

This paper explores how twisted Weyl semimetal interfaces exhibit unique magnetotransport properties, highlighting the significant role of Fermi arc states in conductance, especially under magnetic fields.

Contribution

It introduces the impact of twisted surface projections on conductance via Fermi arc states, a novel aspect in Weyl semimetal junctions.

Findings

Fermi arc states contribute significantly to conductance without magnetic field.

Magnetic fields enhance the role of transverse Fermi arc states in mesoscopic samples.

Both Fermi arc and bulk Landau levels influence conductance in the presence of magnetic fields.

Abstract

We investigate magnetotransport across an interface between two Weyl semimetals (finite in both directions) whose Weyl nodes project onto two different surfaces which are twisted with respect to each other before being coupled. This gives rise to a novel contribution to the conductance through the junction purely through Fermi arc states, even in the absence of a magnetic field perpendicular to the junction. When the perpendicular magnetic field is included, we find that for a mesoscopic or smaller samples, the transverse Fermi arc states have a significant contribution to the conductance for experimentally relevant fields, and need to be taken into account along with the conductance through the bulk chiral Landau levels.