Anisotropic transport in ballistic bilayer graphene cavities

TL;DR

This paper investigates anisotropic electron transport in bilayer graphene cavities, combining simulations and theoretical analysis to identify triangular modes and their impact on transport properties, with implications for experimental detection and control.

Contribution

It verifies the existence of triangular modes in quantum solutions and explores their signatures in transport, advancing understanding of anisotropic transport in bilayer graphene cavities.

Findings

Triangular modes exist in quantum solutions of BLG cavities.

Triangular symmetry causes anisotropic electron transport.

Optimal setups for experimental detection and modulation are proposed.

Abstract

Closing the gap between ray tracing simulations and experimentally observed electron jetting in bilayer graphene (BLG), we study all-electronic, gate-defined BLG cavities using tight-binding simulations and semiclassical equations of motion. Such cavities offer a rich playground to investigate anisotropic electron transport due to the trigonally warped Fermi surfaces. In this work, we achieve two things: First, we verify the existence of triangular modes (as predicted by classical ray tracing calculations) in the quantum solutions of closed circular BLG cavities. Then, we explore signatures of said triangular modes in transport through open BLG cavities connected to leads. We show that the triangular symmetry translates into anisotropic transport and present an optimal setup for experimental detection of the triangular modes as well as for controlled modulation of transport in preferred directions.