Scattering between minivalleys in a moir\'e material

TL;DR

This paper investigates magneto-transport oscillations caused by scattering between minivalleys in moiré materials, specifically in twisted double bilayer graphene, revealing potential scattering mechanisms and their implications.

Contribution

It provides the first detailed analysis of magneto-intersubband oscillations due to minivalley scattering in moiré materials, highlighting possible electron-phonon and valley conserving mechanisms.

Findings

Identification of magneto-intersubband oscillations in twisted bilayer graphene.

Evidence supporting electron-phonon and valley conserving scattering mechanisms.

Discussion of implications for various moiré materials and twist angles.

Abstract

A unique feature of the complex band structures of moir\'e materials is the presence of minivalleys, their hybridization, and scattering between them. Here we investigate magneto-transport oscillations caused by scattering between minivalleys - a phenomenon analogous to magneto-intersubband oscillations - in a twisted double bilayer graphene sample with a twist angle of 1.94{\deg}. We study and discuss the potential scattering mechanisms and find an electron-phonon mechanism and valley conserving scattering to be likely. Finally, we discuss the relevance of our findings for different materials and twist angles.