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Scattering between Minivalleys in Twisted Double Bilayer Graphene.

Petar Tomić¹, Peter Rickhaus¹, Aitor Garcia-Ruiz²

¹Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland.

Physical Review Letters

|February 18, 2022

Summary

Researchers studied scattering between minivalleys in twisted double bilayer graphene. They identified electron-phonon and valley-conserving scattering as likely mechanisms, offering insights into moiré material physics.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Physics

Background:

Moiré materials exhibit complex band structures with unique features like minivalleys.
Scattering between these minivalleys influences electronic properties and transport phenomena.
Understanding these scattering mechanisms is crucial for harnessing moiré material functionalities.

Purpose of the Study:

To investigate magnetotransport oscillations arising from scattering between minivalleys in twisted double bilayer graphene.
To identify the dominant scattering mechanisms responsible for these oscillations.
To explore the implications of these findings for other moiré materials and twist angles.

Main Methods:

Fabrication of a twisted double bilayer graphene sample with a specific twist angle (1.94°).
Experimental measurement of magnetotransport oscillations.
Analysis of oscillation data to deduce scattering mechanisms, comparing with theoretical models.

Main Results:

Observed magnetotransport oscillations analogous to magnetointersubband oscillations.
Identified electron-phonon and valley-conserving scattering as the most probable mechanisms.
Provided experimental evidence for inter-minivalley scattering in this moiré system.

Conclusions:

Inter-minivalley scattering significantly impacts transport properties in twisted double bilayer graphene.
Electron-phonon and valley-conserving scattering are key contributors to this phenomenon.
The findings are relevant for designing and understanding other moiré superlattices.