Shaping chaos in bilayer graphene cavities

TL;DR

This paper explores how rotating the boundary of bilayer graphene cavities induces a transition from regular to chaotic quantum behavior, with implications for quantum chaos research and device engineering.

Contribution

It demonstrates the control of quantum chaos in bilayer graphene cavities through boundary rotation, linking classical and quantum dynamics.

Findings

Boundary rotation induces a transition to quantum chaos.

Eigenvalue statistics change from regular to chaotic.

Classical ray dynamics support quantum observations.

Abstract

Bilayer graphene cavities where electrons are confined within finite graphene flakes provide an alluring platform not only for the future nanoelectronic devices owing to the tunable energy gap but also for investigating the quantum nature of chaos due to the trigonal warping of their Fermi surface. Here we demonstrate that rotating the cavity boundary relative to the underlying lattice structure drives a quantum transition from nearly integrable dynamics to chaotic regime, observed as a concomitant crossover of eigenvalue statistics and eigenstate profiles. Complementing the full quantum treatment, we examine the classical backbone of this onset of chaos by employing semiclassical ray dynamics. Our results position bilayer graphene cavities as a promising venue for investigating and engineering quantum-chaotic behavior in graphene-based devices.